2. 外语
  3. ______in doing an examination, the time passed by quickly.

______in doing an examination, the time passed by quickly.

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问题 ______in doing an examination, the time passed by quickly.
选项 A、Being absorbed
B、Having been absorbed
C、When they were absorbed
D、Be absorbed
答案C
解析 时间状语从句。本题的句子主干已经存在了，主语是the time，选项是be absorbed in doing sth.这个结构的不同形式。首先可以排除A和B两项，因为这两项的逻辑主语应该是人，而不是thetime：D项的形式错误；C项是一个分句，有自己的主语。故答案为C。
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