He didn’t look well, for he ______ for sixteen hours.

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问题 He didn’t look well, for he ______ for sixteen hours.

选项 A、had worked
B、would have worked
C、was working
D、had been working

答案D

解析动词work是在didn’t look well前，故用过去完成进行时。

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大学英语三级A级

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