The Olympic Games are heldA every four years B every four year C every fourth years D every four-years

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The Olympic Games are heldA every four years B every four year C every fourth years D every four-years
The Olympic Games are held
A every four years B every four year C every fourth years D every four-years

The Olympic Games are heldA every four years B every four year C every fourth years D every four-years
a

选a
b、four 是复数了吧,year 肿么能不加s
c、fouth是序数词啦,这里不需要啊,要不然fouth year就解释为第四年啦
d、有-就不可以加s啦,规定。。规定。。