The scientist has made quite a few discoveries, ______ of great importance to th

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问题 The scientist has made quite a few discoveries, ______ of great importance to the whole world.

选项 A、which I think they are
B、which I think are
C、I think which are
D、that I think they are

答案 B

解析语法结构题。此题考查非限定性定语从句。非限定性定语从句不能用关系代词that来引导，因而排除D 项；C 项语序不对；在以Which开头的A 、B 项中，关键要识别出插入语“I think”，这样显然A 项中的they为多余的词，因此B 项为正确答案。

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