单项选择题

Prague offers visitors a series of excursions and leads them into a rich and ______ past.

A．variable
B．diverse
C．different
D．changeable
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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
单项选择题
Who can predict the misery that may ______ humankind
A．happen
B．befall
C．chance
D．occur
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