They overcame all the difficulties and f

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问题 They overcame all the difficulties and fulfilled the plan three months ahead of time,（）is something we had not expected.A.thatB.whatC.itD.which

选项 A.that
B.what
C.it
D.which

答案 D

解析该题考查定语从句。由于两分词间无连接词，故答案C排除，关系代词that不能引导非限定性定语从句，what引导主语从句常在句中做宾语成分，故答案为D，which引导的非限定性定语从句，其先行词是前面的整个句子。

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英语一研究生

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