He made another wonderful discovery, of great importance to science. A. which I
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He made another wonderfuldiscovery, _________ of great importance to science.
A. which I thinkis B.which I think it is
C.which I think it D.I think it is
试题答案
【答案】
A
【解析】I think 是插入语, which 引导一个非限制性定语从句, 在从句中作主语.