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

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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