__________at the door before you enter the office，or you’ll be considered impolite

A. Knocking B. Knocked C. Knock D. To knock

 

C

【解析】

試題分析：考查祈使句。本題考查祈使句 + and / or + 陳述句結(jié)構(gòu)，故用動詞原形。句意：在進辦公室之前敲門，否則你會被認為不禮貌。故C正確。

考點：考查祈使句

 

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