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
______in the company for three years, Mark has become experienced in business negotiations.
A．Having worked
B．Have been working
C．Have worked
D．Worked
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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