Question

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

A．are used to swim; used to keep

B．are used to swimming; used to keep

C．used to swimming; is used to keep

D．used to swim; is used for keeping

Answer 1

D

解析試題分析：be used for sth被用于某事;used to do sth過去常常做某事.句意：當我小的時候，我常常在這個池子里游泳，但是現在它被用來養魚。
考點：used to用法
點評：used to用法比較固定，需要注意use還可以作為被動語態使用，sth be used to do sth某物被用來做某事。