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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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— Hi, Mary. Any idea where Bill is?
— He ______ in the library. I saw him reading books there just now.

A.shall be B.should have been C.must be D.might have been
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—Hi,Mary.AnyideawhereBillis?—H