单项选择题

________ the weather improves, we will suffer a huge loss in the tourist industry.

A．As
B．Since
C．While
D．Unless
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单项选择题
She didn’t know ________ to express her ideas in English clearly in public.
A．which
B．why
C．what
D．how
单项选择题
We must find a way to cut prices ________ reducing our profits too much.
A．without
B．despite
C．with
D．for
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