单项选择题

— ______ are the Olympic Games held
— Every four years.

A. How often
B. How soon
C. How long
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I have two children. One is a teacher, ______ is a doctor.
A. another
B. the other
C. other
单项选择题
Please speak louder ________ we can hear more clearly.
A. so that
B. since
C. when
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