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

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

选项 A、which I think is
B、which I think it is
C、of which I think it is
D、I think which is

答案 A

解析本题考查非限制性定语从句。引导定语从句的关系代词which指代之前的先行词discovery，并做从句中的主语。

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