单项选择题

A．ascertain
B．verify
C．maintain
D．sustain
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单项选择题
A．exhibitingB．holdingC．standingD．Playing
A．exhibiting
B．holding
C．standing
D．Playing
单项选择题
A．placedB．basedC．imposedD．introduced
A．placed
B．based
C．imposed
D．introduced
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