To parse the answer to choose C, why is the other wrong?

The course of history is a tortuous one. But the result is inevitable. Because the wheels of history are only forward.

The above is a conversation between two people, the first person said:"Hey, I heard you went to New Jersey. "The second person said:

I was away from home for two Thursdays and now I'm back. "I'm not at home"It must have been in the past, because now it is where my home is, otherwise how can I talk to the first person? Based on the above analysis, it is known that the simple past tense should be used, so choose 3, was.

We usually see a period of time when we get used to using the perfect tense. But in fact, it has been clearly stated later, I have returned. Then, no matter how much time it is, it will be in the simple past tense.

Indicates what has happened. In other words, the things that have come to an end for a period of time are chosen in the simple past tense.

The answer to this sentence is the reason for choosing tea c, which is based on the following....back now. If you haven't come back now, you have to use the perfect tense, but now you have come back in the past tense. So choose C

Select: wasFor what the master hears is at the same time as he goes out. i.e., the tense of the two sentences is required to be consistent:

hello, i heard you went to new jersey when i was away for a week. but i am back now.

Hello, I heard you went to New Jersey during the week I was out. But I'm back now.

Because in these sentences, the actions it describes are all in the past, so the sentence uses the simple past tense, so the answer c is chosen.

Answer: option C is in the simple past tense, b is in the simple perfect tense, d is in the past perfect tense, heard in the early part of the sentence in the simple past tense, and the sentence in the same tense before and after.

Because I've come back, I can't use been when I go and I go back, I have to use gone. The method of exclusion can be seen to choose C here.

The object clause is in the simple past tense went, and the clause should use the corresponding past tense had been to indicate that the action occurred before went.

First of all, in terms of tense, went is in the past tense, excluding ab.

Align with WENT in time.

For general measuring instruments, the uncertainty within the scope of university physics experiments is taken as 1 2 digits (metrology is generally taken as 2 digits), and if the first digit is not greater than 3, 2 digits are taken; Otherwise, take 2 digits; The rest is rounded up. Here it's all 5, take only 1 digit, ie. Therefore, the error of c(d is obvious, so I will not talk about it.

In addition, the preceding reliable figures are determined in principle by uncertainty (..).

Divided into 5 subnets, the minimum number of assignable IP addresses for the possible subnets is ( ) The answer is C, why?Isn't it b Solution (2) (12) Share Reply (9).

D is definitely not going to work, B is because the Standing Committee of the National People's Congress cannot concurrently hold the post of ** department, and this matter is not something that the Standing Committee can decide.

Jiangsu "Class Workbook"? What a coincidence! I'm also from Jiangsu.

The site of synthesis of ATP is the mitochondrial matrix and inner mitochondrial membrane, not the middle of the tunica vaginalis.

You can get this answer by solving the problem of calculating the arc length of any arc according to the arc length formula of the definite integral, because its integral region is in [c,d].

Personally, I think it's c.

Joint crime: Two or more people commit a joint intentional crime.

There must be two or more persons who commit a joint crime, and after a conspiracy, the criminal intent is the same.

Option D Lu X is a minor, and the robbery is not a criminal act, and Yang X instigates the juvenile to commit a crime, which is an indirect principal offense.

Option C Xu instigated Wu to kill, the two had already agreed and had the same goal, the criminal intent was obvious, and Wu stopped when he was preparing to commit the crime, which should be regarded as criminal preparation.

All things considered, option c is:

The key is to correctly analyze the working status of DA and DA.

Due to the effect of +12V, when the circuit is stable, DB is in the conduction state, so that VY=VB=0V, and the negative potential of DA=3V, so DA is in reverse cutoff. The path of the current is the +12V 3K resistor diode DB VB terminus. Treat db as the ideal diode (the tube voltage drop is zero, so vy = 0v.