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
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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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