Noscientistscanexactlyfigureoutwhat
来源:语文精选馆 2.49W
问题详情:
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
【回答】
A
知识点:词组 短语
题型:选择题