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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
科目 英语   题型 单选题   难度 中等
知识点: 主语+系动词+表语
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