2. 外语
  3. They overcame all the difficulties and completed the project two months ahead of time, ______is something we had not expected.

They overcame all the difficulties and completed the project two months ahead of time, ______is something we had not expected.

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问题 They overcame all the difficulties and completed the project two months ahead of time, ______is something we had not expected.
选项 A、which
B、it
C、that
D、what
答案A
解析 非限制性定语从句引导词用法题。题意：“他们克服了所有的困难，提前两个月完成了项目，这是我们始料未及的。”此处用which指代前面一整句话，属非限制性定语从句，故正确答案为A。
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