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

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

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问题 He has made a discovery, ______of great importance to the progress of science and technology.
选项 A、I think which is
B、which I think is
C、that I think is
D、of which I think it is
答案B
解析 分析句子结构可知，空处之后为非限制性定语从句。that不能引导非限制性定语从句，故排除选项C。而“I think”在句中只能用作插入语，应放在引导词的后面，故排除选项A。which指代的是先行词discovery，在从句中作主语，而不是介词of的宾语。故选B。
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