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、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 语法结构。非限制性定语从句中不可用that引导。在D中，which与 it重复。如果我们把I think看作插入成分就更加容易看清楚了。
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