题目内容

-----the ground is wet.-----Yes， didn't you know? ________for the last 20 minutes.

A. It's raining
B. It was raining
C. It's been raining

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Johnson _____a novel about ancient China last year, but I don't know whetherhe has finished it.

A. has wrote
B. wrote
C. has written
D. was writing

The air will be further polluted unless some measures________.

A. will be taken
B. are taken
C. were taken
D. had been taken

When David arrived, he learned Jack ______for almost two hours.

A. had gone
B. had set off
C. had left
D. had been away

You should have put the yogurt into the fridge. I expect it _____undrinkableby now.

A. became
B. had become
C. has become