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                                               D. I think which is

【解析】选A。考查非限制性定语从句及插入语。此处I think为插入语,which是引导定语从句的关系代词。

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