Keys _______ opening the lock in the door.

A. used for????????? ????????????? B. are used??????? ????????????? C. are used to?????? ????????????? D. are used for

 

【答案】

D

【解析】

試題分析：to到，向，表示動(dòng)作的對(duì)象，目的等；for為了，表示動(dòng)作的目的，原因等；句意：鑰匙是用來(lái)開(kāi)門(mén)上的鎖的。結(jié)合語(yǔ)境可知本句主語(yǔ)是動(dòng)作對(duì)象，故用被動(dòng)語(yǔ)態(tài)，本句中介詞表示動(dòng)作的目的和原因，故選D.

考點(diǎn)：考查介詞及被動(dòng)語(yǔ)態(tài)

 

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