单项选择题

Not until she arrived at the meeting room ________ she had forgotten to bring the document.

A．she realized
B．did she realize
C．she did realize
D．does she realize
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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
Would you please pass me the book ________ cover is black
A．which
B．whose
C．that
D．its
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