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

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

【答案】B

【解析】

試題分析：句意：在公共場所吸煙是不禮貌的。本題是一個不定式作主語的結(jié)構(gòu)：It is +adj+to do sth。前面是一個形式主語it，后面真正的主語用帶to的不定式。故選B。

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