单项选择题

When he tried to make a ______ , he found that the hotel was completely filled because of a convention.

A．reservation
B．claim
C．mess
D．revision
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A body, ______ it is in motion, would never stop itself if there were no friction.
A．where
B．by time
C．once
D．at the moment
单项选择题
There is a way ______ he can be saved.
A．whereas
B．whereby
C．while
D．thereafter
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