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. （2003年考试真题）

选项 A、which
B、it
C、that
D、what

答案 A

解析本题考查which引导非限制性定语从句，其中which指代前面整个句子内容。

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