He has made another wonderful discovery, ______of great importance to science.A、

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问题 He has made another wonderful discovery, ______of great importance to science.

选项 A、who I think it
B、which I think it is
C、that I think is
D、which I think is

答案 D

解析句意：他有了另一项伟大的发现，我认为这对科学有着重大的意义。此从句为非限制性定语从句，修饰主句，所以用关系代词which，排除A、C。其在从句中充当主语，所以it在从句中多余，故答案为D。

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