单项选择题


A．After
B．Before
C．If
D．While
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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
单项选择题
A．havingB．playingC．alsoD．making
A．having
B．playing
C．also
D．making
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