单项选择题

It is the first time that you have been to our country, ______

A．haven't you
B．don't you
C．isn't it
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单项选择题
______ Simon ______ Jack know what has happened.
A．Both... and...
B．Either... and...
C．Either... or...
单项选择题
Mandy did her housework all ______.
A．by herself
B．by she self
C．herself
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