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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 821

Up to now, no one has come up with a(n)       explanation of why dinosaurs died out, and it remains a mystery.

A.astonishing B.amusing C.convincing D.puzzling
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Uptonow,noonehascomeupwitha(n)