单项选择题

According to the passage, the writer probably means to say that ______.

A．UFO doesn't really exist
B．UFO is really unidentified
C．UFO comes from outer space
D．UFO is only people' s imagination
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单项选择题
The UFO the people on board the plane saw is ______.
A．a long object
B．a square object
C．a round object
D．a short object
单项选择题
Mr. Johnson preferred ______ heavier work to do.
A．to be given
B．to be giving
C．to have given
D．having given
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