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—Tom says he is too tired to go on.?
—He can’t be.He ____for an hour.?
A.just worked
B.has only been working?
C.has just worked
D.had only been working?
B?
  考查动词的时态。从本题的语境中可以看出他不可能累的原因是:他从开始工作到现在仅仅才工作了一个小时,因此应该用现在完成进行时。
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