试题详情

They overcame all the difficulties and fulfilled the plan three months ahead of time,（ ）is something we had not expected.

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。