问题
选择题
---How often are the Olympic Games held？ ---_____four years.
A．Every
B．Each
C．In
D．For
答案
答案：A
every four years，表示每隔三年或每四年，表示频率的。故选A
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---How often are the Olympic Games held？ ---_____four years.
A．Every
B．Each
C．In
D．For
答案：A
every four years，表示每隔三年或每四年，表示频率的。故选A