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【题目】—Look!Every desk and every chair in the classroom .

—Oh,it must have taken you lots of time.

A. is cleaned B. are cleaned

C. has been cleaned D. have been cleaned

【答案】C

【解析】考查主谓一致及时态。and连接的并列主语是单数概念,且前面有every,each,no等修饰时,谓语动词用单数。由语境可知此处应用现在完成时,表已经完成的动作。

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