We _____ in this pool when we were young, but now it _____ fish.A.are used to swim; used to keepB.are used to swimming; used to keepC.used to swimming; is used to keepD.used to swim; is used for keeping
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D解析试题分析：be used for sth被用于某事;used to do sth过去常常做某事.句意：当我小的时候，我常常在这个池子里游泳，但是现在它被用来养鱼。考点：used to用法点评：used to用法比较固定，需要注意use还可以作为被动语态使用，sth be used to do sth某物被用来做某事。