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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2004

--- He worked out such different questions at a very young age.
--- Oh, he ______ a very smart student then.

A.could have been B.should have been
C.might have been D.must have been
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Heworkedoutsuchdifferentquesti