单项选择题

The president followed historical ______ in forming the Cabinet.

A．precedent
B．herald
C．ancestor
D．forerunner
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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
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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