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【題目】Our classroom must _____ clean every day.

A. keep B. to keep C. be kept D. to be kept

【答案】C

【解析】試題分析:句意:我們的教室必須每天保持干凈。教室與干凈之間是被動關(guān)系,故使用被動語態(tài)。故選C。

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