—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?
  考查動詞的時態(tài)。從本題的語境中可以看出他不可能累的原因是：他從開始工作到現(xiàn)在僅僅才工作了一個小時，因此應(yīng)該用現(xiàn)在完成進行時。
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