单项选择题

Regional unemployment and regional recession are an economic loss to the whole nation and they cannot ______ themselves on their own.

A．simplify
B．modify
C．verify
D．rectify
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单项选择题
Despite all the policeman's questions the lady continued to ______ that she was innocent.
A．affirm
B．ascertain
C．confirm
D．certify
单项选择题
Hardly a week goes by without some advance in technology that would have seemed ______ 50 years ago.
A．formidable
B．indispensable
C．practicable
D．incredible
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