单项选择题

A doctor, together with two nurses, ______ sent to the mountain village.

A．have
B．have been
C．has
D．has been
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单项选择题
My mother bought that coat ______ a low price.
A．at
B．in
C．on
D．with
单项选择题
Not until quite recently ______ he gave up his plan to go abroad.
A．I knew
B．I had known
C．did I know
D．I did know
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