单项选择题

It is well known that ______ doctors are badly needed in the hospital.

A．a
B．an
C．the
D．×
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单项选择题
If there were no examinations, we should have ______ at school.
A．a more happier time
B．the happiest time
C．a much happier time
D．much happiest time
单项选择题
The celebration has been called ______ because of the bad weather.
A．for
B．off
C．up
D．at
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