单项选择题

It was in this library ______ I met professor Williams.

A．as
B．that
C．where
D．how
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单项选择题
To ______ the temperature of the new machine, the researchers had to work for hours.
A．turn
B．measure
C．find
D．investigate
单项选择题
When we got to the station, we were so sorry to find that the train was ______.
A．taking up
B．taking off
C．pulling away
D．pulling out
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