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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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
Mary ______ that the purchase had been a mistake. However, she didn't.
A．ought to acknowledged
B．ought to have acknowledged
C．should acknowledge
D．should be acknowledging
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