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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单项选择题
John is collaboratingwith Mary in writing an article.
A．cooperating
B．competing
C．combining
D．arguing
单项选择题
These programmes are of immensevalue to old people.
A．natural
B．fatal
C．tiny
D．enormous
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