专四

单选题They overcame all the difficulties and completed the project two months ahead of time, __________is something we had not expected.

A．which 
B．it 
C．that 
D．what

参考答案：A进入在线模考
【译文】他们克服一切困难，提前两个月完成了工程，这让我们颇感意外。
【解析】which引导非限制性定语从句。which引导非限制性定语从句，对主句进行补充说明，在句义上是独立平行的并列意义，相当于并列复合句中的第二分句，这句话里相当于：They overcome all the difficulties and completed the project two months ahead of time，and this is something we had not expected．由于that只能引导限制性定语从句，因此C不可选，B．it和D．what皆不引导定语从句。

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