单项选择题

John had never been abroad before, ________ he found the business trip very exciting.

A．because
B．though
C．so
D．while
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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
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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