单项选择题

Disease can be______, if not more so, to the well-being and progress of a nation than wars or economic depressions.

A．as harmful as
B．harmful
C．as harmful
D．harmful as
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单项选择题
Classes will cease to exist by the time communism______ throughout the world.
A．is achieved
B．has been achieved
C．will be achieved
D．will have been achieved
单项选择题
I should be the______ man to think highly of those Who wake up to persons of influence.
A．right
B．very
C．last
D．same
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