单项选择题

You can go out, _____ you promise to come back before 11 o’clock.

A．as far as
B．as soon as
C．so far as
D．so long as
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单项选择题
Getting young people together will help to _____ the barriers between them.
A．break off
B．break down
C．break up
D．break out
单项选择题
This nurse was _____ when you were sent to the hospital.
A．in turn
B．in practice
C．on duty
D．on business
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