问题补充：
—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
答案：
A. just worked
(答案→)B. has only been working
C. has just worked
D. had only been working
解析：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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