单项选择题

______ there are a large number of chemical factories, the air is likely to be polluted.

A．That
B．Where
C．Once
D．As
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单项选择题
I'm willing to lend you a hand ______ busy I'm for the moment.
A．because
B．but that
C．but
D．however
单项选择题
______ time went on, the teacher's words proved true.
A．As
B．While
C．With
D．When
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