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
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
单项选择题
We always have ______ supper at 7 o' clock, we had ______ good supper yesterday.
A．×,a
B．a, a
C．×,×
D．a,×
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