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【题目】__________ at the door before entering, please.

A.KnockedB.To knockC.KnockingD.Knock

【答案】D

【解析】

句意:请先敲门再进来。

考查祈使句。Knocked过去式;To knock动词不定式;Knocking动名词,现在分词;Knock动词原形;根据“please.”可知是祈使句,可推测出用动词原形开头,所以此处是“Knock”,故选D

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