at the door before you enter my room, please.A. KnockB. KnockingC. KnockedD. To knock

发布时间：2020-08-16 22:36:47

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

网友回答

(答案→)A. Knock
B. Knocking
C. Knocked
D. To knock
解析：考查祈使句。祈使句句首应该使用动词原形。
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