摘要：Mario used to in the morning. A.practice swimming B.practicing swimming C.practice swim D.practicing swimming 答案:A used to do sth.过去常做--.所以排出B.D两项.practice后接动词的-ing形式.
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Mario used to _____________ in the morning.
A. practice swimming B. practicing swimming
C. practice swim D. practices swimming
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Mario used to _____________ in the morning.
A. practice swimming B. practicing swimming
C. practice swim D. practices swimming
查看习题详情和答案>>