单项选择题

He's worked in this school ___________ it opened.

A． for
B． since
C． before
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单项选择题
I have ___________ egg for breakfast every day.
A． an
B． a
C．/
单项选择题
I can't believe you, ___________.
A． and she can't too
B． either can she
C． nor can she
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