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【题目】It's necessary for you the classroom clean, class.

A. keep B. keeping C. to keep

【答案】C

【解析】句意:同学们,保持教室干净对你们来说是必要的。keep动词,保持。本句为固定句型It’s+形容词+for sb.+to do sth., 意为做某事对某人而言是怎样的。其中动词使用动词不定式 “to keep” 的形式, 在句中作真正的主语,it为形式主语故选:C。

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