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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单项选择题
Scientists say it may be ten years ______ this medicine was put to use.
A．since
B．before
C．after
D．when
单项选择题
Here is my card. Let's keep in ______ .
A．touch
B．relation
C．connection
D．friendship
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