题目内容

He has made another wonderful discovery,___ of great importance to science.
A．who I think itB．which I think it isC．that I think isD．which I think is
D
首先去掉插入语I think，使选项明朗化；因前后都是两个无连词的句子，可判断后句为非限制性定语从句。
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