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【题目】It is our duty _________our classroom clean and tidy.

A. to keepB. keepsC. keepingD. kept

【答案】A

【解析】

保持我们的教室整洁干净是我们的职责。本题考查动词不定式作表语。our duty 是真正的主语 ,前面那个it 是逻辑主语 to keep是表语 动词不定时作表语,还原后是:our duty is to keep our classroom and tidy。故选A

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