Mariousedto________inthemorning．A.

发布时间：2020-07-27 05:34:57

Mario used to ________ in the morning．A.practice swimmingB.practicing swimC.practice swimD.practicing swimming

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A解析used to do sth．过去常做……，所以排出B、D项，practice后接动词的-ing形式．
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