单项选择题

It was in the year of 2002______they set up a branch company in China.

A．as
B．that
C．what
D．which
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单项选择题
Jack called the airline to______his flight to Beijing this morning.
A．improve
B．believe
C．confirm
D．insure
单项选择题
What are the essential differences______selling and marketing
A．between
B．from
C．among
D．for
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