单项选择题


A．then
B．therefore
C．so
D．however
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单项选择题
A．athleticB．detectiveC．scientificD．literary
A．athletic
B．detective
C．scientific
D．literary
单项选择题
A．operatingB．runningC．goingD．occurring
A．operating
B．running
C．going
D．occurring
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