【題目】 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】

試題分析：考查插入語：句意：他做出了一個重大發(fā)現(xiàn)，我認為這對科學是非常重要的，which引導的是非限制性定語從句，I think是插入語，在which后面，去掉I think可知which是定語從句的主語，it是多余的，選A 。

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