They overcame all the difficulties and fulfilled the plan ten days ahead of schedule,__________ was something we had not expected．

A．that

B．this

C．it

D．which

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参考答案

答案解析

【参考译文】他们克服了所有的困难并且提前十天完成了任务，这是我们不曾预料到的。
【答案解析】本题考查对句子的理解和从句的使用。因为两句之间没有连词，前面又用的是逗号，所以B和C两个指示代词填进去之后句法就不对，需要用关系代词来连接两个句子。关系代词指代的是前面整个句子，只能用which来引导，答案为D。

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