单项选择题

John is collaborating with Mary in writing an article

A．cooperating
B．competing
C．combining
D．arguing
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单项选择题
He is determined to consolidate his power
A．strengthen
B．control
C．abandon
D．exercise
单项选择题
A great deal has been done to remedy the situation
A．maintain
B．improve
C．assess
D．protect
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