【題目】______ 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:麻煩您進(jìn)我屋之前先敲門。考生若能識別before是狀語從句連接詞,便可想到空格位置應(yīng)該是主句部分的謂語,只有A項(xiàng)符合條件。選A。

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