______ at the door before you…——2012 高考英语第 14 题答案解析

2012_北京卷 (英语)

2012 Beijing Question 14 Single-choice Differentiating

2012_北京卷 (英语)

$31. ______ at the door before you enter my room, please.$

A. Knock

B. Knocking

C. Knocked

D. To knock

Answer key

A

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