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

问题描述:

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

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。。

a