单项选择题

If the world is to remain peaceful the utmost effort must be made by nations to limit local ______.

A．collisions
B．combats
C．contradictions
D．conflicts
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单项选择题
When Mohammed, a man from the Middle East, first went to the United Kingdom to attend the university, ______ with women in the same class.
A．he'd never before studied
B．he would never before study
C．he couldn't before study
D．he hasn't before studied
单项选择题
______ that the trade between the two countries reached its highest point.
A．During the 1960s
B．It was in the 1960s
C．That it was in the 1960s
D．It was the 1960s
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