题目内容
（请给出正确答案）
[主观题]
People who ask the question "Why don't they get in touch with us ... and declare themselve
s？" think that ______.
A．there are no such things as UFOs
B．UFOs are visitors from solar system
C．there's no reason for UFOs not to land on Earth
D．we are bound to see UFOs sooner or later
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