单项选择题

But in the end he approved of our proposal.

A．undoubtedly
B．certainly
C．ultimately
D．necessarily
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单项选择题
A great deal has been done to remedy the situation.
A．maintain
B．improve
C．assess
D．protect
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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