单项选择题

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

A．by an hour
B．by the hour
C．by hour
D．by hours
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单项选择题
It is well known that ______ doctors are badly needed in the hospital.
A．a
B．an
C．the
D．×
单项选择题
The pupils ,said ______ was against their teacher.
A．what were you doings
B．what you were doing
C．what are you doings
D．what were you doing
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