问题
选择题
| — 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
答案：B
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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 |
答案：B