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【题目】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:我们家的窗户一周打扫一次。考查动词时态和被动语态。once a week每周一次,用于一般现在时,可排除AD两项。主语the window是单数第三人称,同时是动词clean的受动者,需用被动语态,即is+过去分词结构,故选B。

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