单项选择题

—I'm sorry I can't do it.
-- __________.

A．Not at all
B．You are welcome
C．It doesn't matter
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单项选择题
— ____________ do you go to the cinema—Once a month.
A．How long
B．How often
C．How much
单项选择题
Mrs. Zhang is a friend of________.
A．John's mother
B．mother of John
C．John's mother's
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