题目内容

He looks very tired . He ______ to bed too late last night.


  1. A.
    must go
  2. B.
    must have gone
  3. C.
    could go
  4. D.
    didn''t go
B
must 用于表示推测时,只能用于肯定句,完成式表示对过去情况的推测。
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