题目内容
No scientists can exactly figure out what ________ happened ________ at that time, which caused the extinction of the dinosaurs.
A. on earth; on the earth
B. on the earth; on earth
C. on earth; on earth
D. on the earth; on the earth
A
【解析】
试题分析:考查短语辨析。句意:没有科学家能够弄清楚当时地球上到底发生了什么事情,这件事导致了恐龙的灭绝。on earth到底,究竟;on the earth在地球上,故选A。
考点:考查短语辨析
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