【題目】The window of our house _______ once a week.

A. have been cleaned B. is cleaned C. are cleaned D. are cleaning

【答案】B

【解析】句意:我們家的窗戶一周打掃一次?疾閯(dòng)詞時(shí)態(tài)和被動(dòng)語態(tài)。once a week每周一次,用于一般現(xiàn)在時(shí),可排除AD兩項(xiàng)。主語the window是單數(shù)第三人稱,同時(shí)是動(dòng)詞clean的受動(dòng)者,需用被動(dòng)語態(tài),即is+過去分詞結(jié)構(gòu),故選B。

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