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【题目】—_______ to keep our classroom clean and tidy.

—You are right.

A. That’s our duty B. This is our duty

C. It’s our duty D. The duty is

【答案】C

【解析】

试题分析:句意:保持我们的教室干净整洁是我们的职责。——你说的对。此句的动词不定式是真正的主语,用it放在句首作形式主语。故答案为C。

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