2. 专升本
  3. It was midnight and he was tired because he___________since dawn.

It was midnight and he was tired because he___________since dawn.

admin2021-06-28  41
问题 It was midnight and he was tired because he___________since dawn.
选项 A、was working
B、has worked
C、has been working
D、had been working
答案D
解析 根据句意和was tired可知，work这一动作是在过去某个时间之前一直存在的状态，且当时仍在进行，所以应用过去完成进行时。故选D。
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