单项选择题

— () was Winter Olympics held —Every four years.

A．How soon
B．How long
C．How far
D．How often

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单项选择题
The crime rate has continued to rise in American cities despite efforts on the part of both government and private citizens to curb ().

A．them
B．its
C．him
D．it
单项选择题
—He is quite tall for a boy of fifteen. —In fact he is ().

A．taller than all his class
B．the tallest of his friends
C．taller than most boys of his age
D．the tallest of the rest of his class
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