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