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】

試題分析：考查短語辨析。句意：沒有科學家能夠弄清楚當時地球上到底發(fā)生了什么事情，這件事導致了恐龍的滅絕。on earth到底，究竟；on the earth在地球上，故選A。

考點：考查短語辨析

 

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