单项选择题

There are over 100 night schools in the city, making it possible for a professional to be reeducated no matter ______ he does.

A．how
B．where
C．what
D．when
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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
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
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