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

Aare used to swimused to keep

Bare used to swimming;is used to keep

Cused to swimused to keep

Dused to swim;is used for keeping

1、D

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

A.a(chǎn)re used to swim:used to keep

B.a(chǎn)re 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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