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You ______ be tired--you've only been working for an hour.


  1. A.
    must not
  2. B.
    won't
  3. C.
    can't
  4. D.
    may not
C
解析:
根据题意,这里表示“不可能”。may, must表推测时,常常用于肯定句,不用于否定句、疑问句。如果需要,否定句、疑问句中常用can。另外,may not表示“可能不”的意思。
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