He made another wonderful discovery, of great importance to science. A. I think which is B. which I think it is C. which I think is D. which I think it 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. I think which is

B. which I think it is

C. which I think is

D. which I think it

答案：C
解析：

which引导一个非限制性定语从句，同时在定语从句中作动词is的主语。

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