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It is not polite ____ in public places. ...

It is not polite ____ in public places.

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

 

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。 考点:考查动词不定式。  
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