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---Has Peter handed in his paper yet?
---I’m not sure．He _______ on it last week．
A．was working B．has worked
C．worked D．had worked
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---Has Peter handed in his paper yet?
---I’m not sure．He _______ on it last week．
A．was working B．has worked
C．worked D．had worked
查看习题详情和答案>>---Has Peter handed in his paper yet?
---I’m not sure．He _______ on it last week．
A．was working B．has worked
C．worked D．had worked
查看习题详情和答案>>
--Has Peter handed in his paper yet?
---I’m not sure. He _______ on it last week.
| A．was working | B．has worked | C．worked | D．had worked |