题目内容

He has made another wonderful discovery, _____ I think is of great importance to science.   
A．whichB．whatC．whenD．that
A
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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