单项选择题

A．way
B．path
C．course
D．route
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单项选择题
A．untilB．beforeC．whenD．as
A．until
B．before
C．when
D．as
填空题
Many economists believe that in the last long run, the cure for the immense problems of poor countries _______________________________ (还是在于经济的快速发展).
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