单项选择题

Your mother is a nurse, ______ she

A． does
B． is
C． isn't
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单项选择题
—Can you lend me your bike —No______.
A． I needn't
B． I mustn't
C． sorry
单项选择题
There is ______ old man in the house.
A． an
B． a
C． the
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