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【题目】______ at the door before you enter my room, please.
A.Knock
B.Knocking
C.Knocked
D.To knock

【答案】A
【解析】句意:麻烦您进我屋之前先敲门。考生若能识别before是状语从句连接词,便可想到空格位置应该是主句部分的谓语,只有A项符合条件。选A。

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