单项选择题


A．showed
B．shows
C．show
D．had shown
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单项选择题
A．observationB．captureC．phenomenonD．process
A．observation
B．capture
C．phenomenon
D．process
单项选择题
A．in order thatB．so thatC．as long asD．because
A．in order that
B．so that
C．as long as
D．because
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