单项选择题


A．expectation
B．participation
C．cooperation
D．collaboration
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单项选择题
A．areB．wereC．have beenD．had been
A．are
B．were
C．have been
D．had been
单项选择题
A．sitB．satC．seatingD．seated
A．sit
B．sat
C．seating
D．seated
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