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We         in this pool when we were youngbut now it       fish

Aare used to swimused to keep

Bare used to swimmingis used to keep

Cused to swimused to keep

Dused to swimis used for keeping

1、D

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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;is used to keep

C.used to swim;used to keep

D.used to swim;is used for keeping

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