The physicist has made a discovery, ______ of great importance to the progress o

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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

解析插入语题。题意：“这名物理学家有一个发现，我认为它对科技进步具有重大意义。”这里I think是插入语。去掉插入语，原文为：…which is of great importance…。因此，C为正确项。

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