单项选择题

______ Simon ______ Jack know what has happened.

A．Both... and...
B．Either... and...
C．Either... or...
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单项选择题
Mandy did her housework all ______.
A．by herself
B．by she self
C．herself
单项选择题
He was so hungry that he had ______ all the dishes.
A．eaten up
B．eaten out
C．eaten off
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