【題目】—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】考查主謂一致及時(shí)態(tài)。and連接的并列主語是單數(shù)概念，且前面有every，each，no等修飾時(shí)，謂語動(dòng)詞用單數(shù)。由語境可知此處應(yīng)用現(xiàn)在完成時(shí)，表已經(jīng)完成的動(dòng)作。

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