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【题目】He has made a discovery, _________ of great importance to the progress of science and technology.

A.I think which is B.which I think is

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

【答案】B

【解析】

试题分析:考查定语从句。句意:他做了一个调查,这个调查我认为它是很重要的对于科学技术的提高。非限制性定语从句which在句首,which做主语,不加it,根据句意知选B。

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