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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2039

The wreckage of something like a jet plain discovered in the heart of the desert is believed ______ a UFO and _______down for reasons still mysterious.

A.to be; have fallen B.to have been; to have fallen
C.to be; to fall D.having been; having fallen
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Thewreckageofsomethinglikeajet