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、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 本题考查定语从句。分析句子结构可知,逗号后为非限制性定语从句,且从句中缺少主语和谓语。which引导定语从句,在句中做主语,is做谓语,I think为插入成分,故答案为[D]项。
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