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

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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。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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