单项选择题

I didn't know he came back ______ I met him in the street.

A． since
B． when
C． until
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单项选择题
You'd better ______ late for school next time.
A． don't
B． not be
C． not to be
单项选择题
Of all the subjects, I like Chinese ______.
A． better
B． best
C． well
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