She is almost 2 hours lateShe is almost 2 hours late. What ________ to her?


  1. A.
    should have happened
  2. B.
    must have happened
  3. C.
    may have happened
  4. D.
    can have happened
D
在疑問句中表示推測，應(yīng)使用“can”；是對過去情況的推測，所以使用can have done在疑問句中表示推測，應(yīng)使用“can”；是對過去情況的推測，所以使用can have done。
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