单项选择题


A．before
B．because
C．when
D．since
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单项选择题
A．importedB．exploitedC．specifiedD．received
A．imported
B．exploited
C．specified
D．received
单项选择题
A．fromB．downC．outsideD．back
A．from
B．down
C．outside
D．back
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