Look!John and Jim’s room is empty but the light is on and door is open．Where ________ they ________?


  1. A.
    may; go
  2. B.
    can; have gone
  3. C.
    should; go
  4. D.
    would; have been
B
情態(tài)動詞表達(dá)疑問的推測用法。用can表達(dá)。
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