【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：請(qǐng)?jiān)谶M(jìn)人我的房間前先敲門。動(dòng)詞原形構(gòu)成祈使句。

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