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-高中英语-n多题

◎ 题干

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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◎ 解析

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◎ 知识点

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