单项选择题

Though steam engines have now passed the _________ of their usefulness, their heritage remains.

A．prime
B．era
C．epoch
D．date
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单项选择题
When they had finished reading, the children were told to _________ all the picture books they had taken out.
A．put up
B．put off
C．put away
D．put out
单项选择题
The patients believe that Dr. Smith knows exactly how to put them _________.
A．right
B．correct
C．well
D．straight
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