单项选择题

Very few experts ______ with completely new answers to the world's economic problems.

A．come to
B．come round
C．come up
D．come on
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单项选择题
As soon as the exam was over, the students all went their ______ ways.
A．homely'
B．perspective
C．respective
D．relative
单项选择题
Slavery was ______ in America in the 19th century.
A．cancelled
B．completed
C．accomplished
D．abolished
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