Question

We _____ in this pool when we were young, but now it _____ fish.

1. A.
   are used to swim; used to keep
2. B.
   are used to swimming; used to keep
3. C.
   used to swimming; is used to keep
4. D.
   used to swim; is used for keeping

Answer 1

D
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。