He made another wonderful discovery, of great importance to science. [ ] A．which I think is B．which I think it is C．which I think it D．I think is 题目和参考答案——青夏教育精英家教网—

题目内容

He made another wonderful discovery, ________ of great importance to science.

[　　]

A．which I think is	B．which I think it is
C．which I think it	D．I think is

答案：A
解析：

选项B重复了宾语it，因为关系代词which是think的逻辑宾语；此外，引导非限定性定语从句的连词不能省略，故选项D也不对．

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