单项选择题

We are happy at the good news ________ Mr. Black has been awarded the Best Manager.

A．that
B．which
C．what
D．whether
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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
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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