单项选择题

It is only through practice ______ one will be able to swim skillfully.

A．what
B．who
C．that
D．which
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单项选择题
So far there is no proof ______ people from other planets do exist.
A．which
B．how
C．what
D．that
单项选择题
We came into this field late, so we must work hard to ______ the lost time.
A．make up for
B．make out
C．keep up with
D．put up with
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