—" Do you often swim now ?" —"No, but I ______ when I was in my fifties ."

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问题 —" Do you often swim now ?" —"No, but I ______ when I was in my fifties ."

选项 A、used to
B、am used to it
C、used to do
D、was used to doing

答案C

解析 used to do sth.过去常常做某事。其中do代替的是前面提到的swim.
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