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
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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
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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