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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.ar...
题目内容：
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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