摘要： 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 There are about fifteen hundred languages in the world.
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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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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 |
查看习题详情和答案>>