Keys _______ opening the lock in the door.
A.used forB.a(chǎn)re usedC.a(chǎn)re used toD.a(chǎn)re used for
D

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(jié)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.
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