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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 933

.Your son has kept _________ for two hours. You’d better ask him to have a rest.

A.study B.studied C.to study D. studying
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.Yoursonhaskeptfortwohours.You