—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?


解析:

  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，因此應該用現(xiàn)在完成進行時。

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