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

解析本题考查语法结构。which引导非限制性关系从句，对主句所表达的内容进行评价。若用that，就会导致句子堆砌，除非that前加but／and等连词。本题译文：他们克服了所有的困难，提前两个月完成了那个项目，这是我们没有预料到的。

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