Noscientistscanexactlyfigureoutwhat
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- 關注:2.32W次
問題詳情:
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
知識點:詞組 短語
題型:選擇題
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