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

解析定语从句题。句子主干是They overcame all the difficulties and completed the project。非限制性定语从句中，关系代词which指代前面整句话：“他们克服困难并提前完成任务”这件事。因此选择A。

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