The physicist has made a discovery, ______of great importance to the progress of

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问题 The physicist has made a discovery, ______of great importance to the progress of science and technology.

选项 A、I think which is
B、that I think is
C、which I think is
D、which I think it is

答案 C

解析非限定性定语从句题。that不能引导非限定性定语从句，故[B]可排除。which是关系代词，先行词是discovery，which在从句中作主语，I think是插入语，所以本题应选[C]。

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