单项选择题

The boy dived into the water and after ______ seemed to be a long time, he came up again.

A．what
B．that
C．it
D．which
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单项选择题
—Can you tell me anything about the fire ______ last night —I'm afraid, ______
A．taking place, a little
B．that broke out, very little
C．broke out, just a little
D．happened, quite a few
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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