[题目] It is not polite in public places.A. smokes B. to smoke C. smoked D. smoking 题目和参考答案——青夏教育精英家教网—

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【题目】 It is not polite ____ in public places.

A. smokes B. to smoke C. smoked D. smoking

【答案】B

【解析】

试题分析：句意：在公共场所吸烟是不礼貌的。本题是一个不定式作主语的结构：It is +adj+to do sth。前面是一个形式主语it，后面真正的主语用带to的不定式。故选B。

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