He has made another discovery, ______ of great importance to science.

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问题 He has made another discovery, ______ of great importance to science.

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

答案C

解析 which引导非限定性定语从句。严格意义上说，插入语并不算句子成分，只是起到补充说明的作用。本句中插入语是I think。

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