单项选择题

The south of the country grows richer, ______ the north grows poorer.

A．until
B．while
C．unless
D．as
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单项选择题
She had made ______ many mistakes in the article that I didn't know what she wanted to tell us.
A．so
B．such
C．enough
D．at
单项选择题
His teacher ______ concern about the progress he had made at school.
A．expressed
B．exported
C．exploded
D．exposed
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