单项选择题

I've kept up a friendship with a girl whom I was at school ______ twenty years ago.

A．about
B．since
C．till
D．with
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单项选择题
Doing your homework is a sure way to improve your test scores, and this is especially true ______ it comes to classroom tests.
A．before
B．as
C．since
D．when
单项选择题
I apologize if I ______ you, but I assure you it was unintentional.
A．offend
B．had offended
C．should have offended
D．might have offended
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