题文
-- Tom says he is too tired to go on.
-- He can’t. He ________ for an hour.
| A．had worked | B．has just worked |
| C．just worked | D．has only been working |
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-- Tom says he is too tired to go on.
-- He can’t. He ________ for an hour.
| A．had worked | B．has just worked |
| C．just worked | D．has only been working |
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