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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
首先去掉插入語I think，使選項(xiàng)明朗化；因前后都是兩個(gè)無連詞的句子，可判斷后句為非限制性定語從句。
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