2. 专升本
  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
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