单项选择题

Every day I listen to English on the radio. Here "on" can be replaced by ______ .

A．through
B．over
C．in
D．by
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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
— ______ was Winter Olympics held —Every four years.
A．How soon
B．How long
C．How far
D．How often
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