单项选择题

From the tears in Nedra's eyes we can deduce that something sad ______.

A．must have occurred
B．would have occurred
C．might be occurring
D．should occur
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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
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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