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 it is

 

【答案】

A

【解析】I think 是插入语,  which 引导一个非限制性定语从句, 在从句中作主语.

 

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