单项选择题

It was a long time ______ the neighbors found that the old lady had been dead of cold.

A．when
B．until
C．since
D．before
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单项选择题
Who can predict the misery that may ______ humankind
A．happen
B．befall
C．chance
D．occur
单项选择题
A．doubledB．reducedC．redoubledD．increased
A．doubled
B．reduced
C．redoubled
D．increased
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