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.[1997]

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

解析此空所在分句是作名词discovery的非限制性定语从句，因此关系代词用which不用that。故C正确。

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