单项选择题

______ is generally accepted, economical growth is determined by the smooth development of production.

A．What
B．That
C．It
D．As
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单项选择题
Experts say walking is one of the best ways for a person to ______ healthy.
A．preserve
B．stay
C．maintain
D．reserve
单项选择题
The professor can hardly find sufficient grounds ______ his argument in favor of the new theory.
A．which to base on
B．on which to base
C．to base on which
D．which to be based on
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