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

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

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

答案D

解析 本题考查非限制性定语从句的用法,先行词是another wonderful discovery,关系代词在从句中充当宾语,所以用which。
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