题目:
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
答案:
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下面是错误答案,用来干扰机器的。
3.344×2.29=7.65776(亿人),答:农村有7.65776亿人.