2. 外语
  3. The physicist has made a discovery, _______ of great importance to the progress of science and technology.

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、which I think it is
B、which I think is
C、that I think is
D、I think which
答案B
解析 非限定定语从句，关系代词在定语从句中做主语。
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