单项选择题

By the time you arrive in London, we ______ in Europe for two weeks.

A．shall stay
B．have stayed
C．will have stayed
D．have been stayin
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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
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
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