单项选择题


A．forced
B．reinforced
C．forcing
D．enforced
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单项选择题
A．concernsB．concernC．concerningD．concerned
A．concerns
B．concern
C．concerning
D．concerned
单项选择题
A．continuousB．continuouslyC．continuingD．continual
A．continuous
B．continuously
C．continuing
D．continual
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