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
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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
单项选择题
The teacher ______ the students on a tour through the art museum.
A．made
B．indicated
C．forced
D．took
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