-----The windows must have taken you quite a long time that day. ------Right. Th

题型：不详难度：来源：

-----The windows must have taken you quite a long time that day.
------Right. They for weeks.

A．haven’t been cleaned

B．hadn’t been cleaned

C．didn’t clean

D．haven’t cleaned

答案

解析

略

举一反三

Mr. Smith found that gas from the pipe when he came back because we forgot to switch off. But at last we were lucky to escape .

A．escaped, being punished	B．was escaping, being punished
C．escaped, punishment	D．was escaping, punishing

题型：不详难度：| 查看答案

---Where _______ my book ? I can"t see it anywhere.
--- I _______ it on this table . But now it"s gone .
A were you putting ; have put B. had you put ; was putting
C have you put ; put D. did you put ; have put

题型：不详难度：| 查看答案

一Tom，you’ve got an A in the final English exam．Congratulations!
一Thanks．But I never thought the result came out so fast．The papers when I left the
Teacher’s office just now．

A．had been marked	B．were still being marked
C．are still marking	D．had been marking

题型：不详难度：| 查看答案

The Internet celebrated its birthday on September 2nd, by which time 40 years _______ since the first successful transfer of data between two computers.

A．has passed

B．had passed

C．passed

D．have passed

题型：不详难度：| 查看答案

——Is there any possible way to help them get rid of such a bad habit?
——To tell the truth, it’s very hard. But we_______ on this problem.

A．worked

B．had worked

C．are working

D．had been working

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