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

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(dòng)詞原形。句意:在進(jìn)辦公室之前敲門,否則你會(huì)被認(rèn)為不禮貌。故C正確。
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