单项选择题

A．purchase
B．shopping
C．exchange
D．market
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单项选择题
A．itselfB．itC．themD．themselves
A．itself
B．it
C．them
D．themselves
单项选择题
A．performingB．workingC．operatingD．managing
A．performing
B．working
C．operating
D．managing
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