题目内容
He made another wonderful discovery, _____ of great importance to science.
A. which I think is B. which I think it is
C. which I think it D. I think which is
A
此句是整个句子He made another wonderful discovery作先行词的非限定性定语,
从句缺少主语,which代替整个句子作主语,is of great important to为固定词组,I think为插入语。

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