单项选择题

The border incident led to the two countries' ______ diplomatic relations.

A．pulling off
B．breaking off
C．passing off
D．falling off
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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
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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