---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 |
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