【題目】It is impolite _____loudly in public places.

A.speakB.to speakC.speakingD.speaks

【答案】B

【解析】

句意:在公共場所大聲說話是不禮貌的。

考查動詞非謂語。A. speak說,動詞原形;B. to speak動詞不定式;C. speaking動名詞或現(xiàn)在分詞;D. speaks第三人稱單數(shù)。It is+adj.+to do sth.是固定句型,意為“做某事是……的”,其中it是形式主語,真正的主語是后面的動詞不定式;故答案選B。

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