单项选择题

A．whereas
B．if
C．while
D．although
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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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