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__________at the door before you enter the office,or you’ll be considered impolite
A.KnockingB.KnockedC.Knock D.To knock
C

试题分析:考查祈使句。本题考查祈使句 + and / or + 陈述句结构,故用动词原形。句意:在进办公室之前敲门,否则你会被认为不礼貌。故C正确。
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