单项选择题

--Must I turn off the light when I leave
--No, ______

A．you mustn't
B．you can't
C．you needn't
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单项选择题
This pencil is ______.
A．my brother's one
B．my brother's
C．my brother one
单项选择题
There are some pictures in ______ old book.
A．a
B．an
C．the
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