My question is the second question, why can t I choose A

This afternoon is in the present continuous tense, not in the future.

The analysis process and results are shown below.

Because that's how the correct answer should be.

b, the end of the thread is loose, then the light must not be able to turn on.

c, the switch is short-circuited, so whether the switch is pulled open or closed, the current can always pass through the lamp. So the switch doesn't work.

d, this is terrible, the light must not be on, and the positive and negative poles are directly connected together, either tripping, or burning the line, or burning the power supply.

So, if you choose A, you must be wrong. Only in this case will the switch fail.

I can't choose A.

First of all, the switch is connected in series, and whether the switch is open or closed, the bulb is on, then the switch must be short-circuited, and it does not play the role of a switch, and the line is on.

Then in option A, the situation described has nothing to do with the switch at all, and there is a point, the live wire is directly connected to the lamp holder, then the bulb is short-circuited, and the light will not turn on.

And the switch is disconnected and will not form a loop. and the situation described in the title is not paid.

Because the sum of the moments in figure A is not equal to 0, assuming that the 4 forces are all moments at the center of the quadrilateral, it can be seen that the moments produced by the 4 forces are all counterclockwise, and their sum is not equal to 0, while in Figure B, the resulting moments are 2 clockwise and 2 counterclockwise, and their sum is equal to 0

Because the force of a is not at the equilibrium level and is unstable, it cannot be chosen.

Look at the last word bear as a verb is to endure, and the meaning of bear sorrow is to endure sorrow.

amazement means surprised.

I am surprised that I can use feel amazement, so it is more suitable to choose sorrow.

According to the meaning of the sentence, it should be c sadness, and the meaning of the other words is incorrect.

Meaning: The grief caused by the death of her husband is almost unbearable.

The reason for choosing a is wrong: beard is a transitive verb that expresses the origin of "to face bravely", and you see that there is a preposition "to" in front of anything as its object"It certainly doesn't make sense, because only the object after the intransitive verb should add a preposition. Also, beard is the verb archetype and the sentence is in the present perfect tense obviously requires the past participle of the verb, and the past participle of beard should be bearded

It is possible that you take the word as the past participle form of "bear" and "endure", because the meaning of the sentence makes sense, but the past participle of bear is born, so option A is not selected. I hope it helps, I'm an international student in North America. Learning English starts with mistakes, so don't be afraid to take your time.

Doesn't beard mean beard? Does it mean anything else?

Should you choose d is to answer the above question, what's wrong with you? I fell out of my chair while cleaning the window. This is an adverbial clause with a table time. The subject in while i was cleaning the window is omitted.

cleaning as a present participle can also be used as a non-predicate verb in a sentence to indicate an accompanying state, or a cause. For example, falling down from the chair, he was sent to hospitalHe fell out of his chair and was taken to the hospital.

The sentence in the title, the clause and the main clause have no causal relationship and accompanying state, so the logic is wrong, and A cannot be selected

to do sth.It is another form of non-predicate verb--- infinitive, which mainly indicates a purpose or indicates an action that will occur in the future. Looking at it this way, D is more relevant to the topic.

While... must add a while

As for the situation where you don't want to add while, it must be an accompanying action, such as brushing your teeth with singing. And here it is not involved in the glass cleaning that accompanies the fall.

If the verb is used directly here and there are only a few meanings, it can be done as a cause adverbial, a way adverbial, an accompaniment, and so on. You can check this online. Here is the simple temporal adverbial, i.e., when ......, I fell.

Just use while to lead to the temporal adverbial clause.

Item d is used as an adverbial in the continuous tense, and the verb archetype is not.

B indicates the purpose, I fell from the chair to clean the glass...

Because aab (both sides of the inequality are multiplied by a negative number a, and the direction of the inequality sign must be changed), a is not true.