He has made another wonderful discovery,

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

选项 A. which I think is B. which I think it isC. I think which is D. of which I think it is

答案A

解析“which I think is”是“which”引导的一个非限定性定语从句，此处修饰“discovery”。故选A。此句意为：他已经创造了另外一个伟大的发现，我认为对科学是至关重要的。

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