单项选择题

--How did you pay the workers--As a rule, they were paid by ______.

A．the hour
B．an hour
C．hour
D．the time
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单项选择题
Don't leave matches or cigarettes on the table within the ______ of little children.
A．hand
B．reach
C．space
D．distance
单项选择题
The streets were empty ______ the policemen on duty.
A．besides
B．except
C．excepting
D．except for
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