单项选择题

The strange orange lights were first seen ______.

A．from the ground
B．from a rocket ship
C．during World War Ⅰ
D．during World War Ⅱ
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A．havingB．playingC．alsoD．making
A．having
B．playing
C．also
D．making
单项选择题
A．solutionB．resultC．keyD．answer
A．solution
B．result
C．key
D．answer
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