单项选择题

A．until
B．before
C．when
D．as
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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).
单项选择题
A．practicalB．practisingC．practiceD．practised
A．practical
B．practising
C．practice
D．practised
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