单项选择题

Ask your father for some money, ______ you will be unable to buy a bicycle before September.

A．or
B．and
C．then
D．so
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单项选择题
Please pay a visit to us, ______ you come to this city.
A．whichever
B．however
C．whatever
D．whenever
单项选择题
Bill Clinton was the president of the United States from 1992 to 2000, ______ the US economy enjoyed a rapid growth.
A．during which time
B．for which time
C．during whose time
D．by that time
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