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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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
______ 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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