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The wreckage of something like a jet plain discovered in the heart of the desert is believed ______ ...
题目内容：
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.
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A．to be; have fallen |
B．to have been; to have fallen |
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C．to be; to fall |
D．having been; having fallen |
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