--It ____ Jack who is at the gate of the library.

--It ____ him. I saw him off at the railway station just an hour ago.


  1. A.
    can be; can't be
  2. B.
    must be; can't be
  3. C.
    can be; must have been
  4. D.
    must be; can't have been
B
must用于表示肯定推斷，意為“想必”“一定”，表示否定推斷，不可能時卻不用mustn't，而用can't。本題兩處空白都是對現(xiàn)在情況的推斷，故用不定式一般式。
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