单项选择题

Social evils were fundamentally caused by ______ inequality.

A．economy
B．economical
C．economics
D．economic
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______ second thoughts, I have decided to give up my visit to Shanghai.
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B．By
C．On
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Only then ______ the importance of education.
A．I understand
B．did I understand
C．did I understood
D．do I understand
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