单项选择题

There has been a great increase in retail sales, ______

A．does there
B．isn"t there
C．hasn"t there
D．isn"t it
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单项选择题
______ the help of their group, we would not have succeeded in the investigation.
A．Besides
B．Regardless of
C．But for
D．Despite
单项选择题
All human beings have a comfortable zone regulating the ______ they keep from someone they talk with.
A．distance
B．scope
C．range
D．boundary
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