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，表示動作的對象，目的等；for為了，表示動作的目的，原因等；句意：鑰匙是用來開門上的鎖的。結合語境可知本句主語是動作對象，故用被動語態(tài)，本句中介詞表示動作的目的和原因，故選D.

考點：考查介詞及被動語態(tài)

 

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