They overcame all the difficulties and completed the project two months ahead of

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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

解析关系代词用法题。本句的后半部分为非限制性定语从句，由关系代词which引导，用来代替前文的内容，其他选项都不能引导非限制性定语从句，故[A]正确。

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