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A
Knocking
B
Knock
C
Knocked
D
To knock
正确答案 :B
解析
[翻译]进入房间之前请先敲门。 [考点]祈使句 【精析】B祈使句表示请求、命令、要求、建议等语气,一般没有主语,结尾常加please,谓语动词用原形,本句表示命令的语气。
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