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【题目】Keys are used________the door.

A.openB.to openingC.to openD.opening

【答案】C

【解析】

句意:钥匙被用来开门。

考查非谓语动词形式。open动词原形;to opening介词+动名词形式;to open动词不定式;opening动词的现在分词或动名词;动名词形式。be used to do意为“被用来去做某事”,be used构成被动语态,后接to do不定式作主语补足语。故选C

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