He has made another wonderful discovery, I think is of great importance to science. A. wh

发布时间：2020-08-16 22:32:08

He has made another wonderful discovery,      I think is of great importance to science.   
A. which
B. what
C. when
D. that

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(答案→)A. which
B. what
C. when
D. that
解析：考察定语从句。Which指代先行词discovery在句中作主语。What不是定语从句的关系词，when是关系副词，that不能引导非限制性定语从句。故A正确。
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