问题描述：
We _____ swim every day when we were children.
A.is B.has been C.would D.used to
请详细分析考察的知识点,并说明所选答案的原因
A.is B.has been C.would D.used to
请详细分析考察的知识点,并说明所选答案的原因
问题解答：
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