【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(chǎng)所吸煙是不禮貌的。本題是一個(gè)不定式作主語(yǔ)的結(jié)構(gòu)：It is +adj+to do sth。前面是一個(gè)形式主語(yǔ)it，后面真正的主語(yǔ)用帶to的不定式。故選B。

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