Two answer are correct.

　　I haven't seen Mark for such a long time.

　　A:How many children does he have?

　　B:How many children do he have?

　　C:How many children he has gotten?

　　D:How many Children has he got?

　　答案：AD

　　One answer is correct.

　　When did you last go on holiday?

　　A: I was gone for three months.

　　B:I went since three months.

　　C: I have gone for three months.

　　D: I went three month ago.

　　答案：D

　　One answer is correct.

　　By the year 最新或2023（历届）, I ____ for the company 25 years.

　　A:Will be working

　　B:will work

　　C:had been working

　　D:will have benn working

　　答案：D

　　One answer is correct

　　The man sitting next to me on the plane was very nervous.

　　A:He hasn't flown before.

　　B:He didn't fly before.

　　C:He hadn't flown before.

　　D:He wasn't flying before.

　　答案：C

　　One answer is correct.

　　Athens is older than sydney.

　　A:Sydney isn't older as Athens.

　　B:Sydney is less older as Athens.

　　C:Sydney is as yonger as Athens.

　　D：Sydney is not older than Athens.

　　答案：B