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
She had two daughters, became doctors.
A．all the them
B．all of who
C．both of whom
D．all of whom
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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