【題目】The windows of our classroom____twice a month.

A. clean B. cleaned C. is cleaned D. are cleaned

【答案】D

【解析】句意：我們教室的窗戶每月擦兩次�？疾楸粍诱Z態(tài)，結構是be+過去分詞；主語窗戶為復數(shù)，故選D。

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