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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Would you please pass me the book ________ cover is black
A．which
B．whose
C．that
D．its
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It is important that we ________ the task ahead of time.
A．will fish
B．finished
C．finish
D．shall finish
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