[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 isC．which I think it D．which I think it is 题目和参考答案——青夏教育精英家教网—

题目内容

【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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