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

解析句意为“他又有了另一个发现，我认为这对于科学界具有非常重大的意义”。本题考查： (1)非限制性定语从句，详见34题所述；(2)插入语。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。

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