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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1271

—Is Jason all right? He looks so tired!
—Not sure. He __________ deep into the night yesterday. He's having an exam soon.

A.may have studied
B.should have studied
C.might study
D.must have been studying
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—IsJasonallright?Helookssotire