the Olympic Games are held once ___A every four years B .every four year C.every -four -year怎样区分呢?为什么B 不可以呢？Every week 后面也不加s啊？

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theOlympicGamesareheldonce___AeveryfouryearsB.everyfouryearC.every-four-year怎样区分呢?为什么B不可以呢？Everyweek

the Olympic Games are held once ___A every four years B .every four year C.every -four -year怎样区分呢?为什么B 不可以呢？Every week 后面也不加s啊？
the Olympic Games are held once ___
A every four years B .every four year C.every -four -year怎样区分呢?
为什么B 不可以呢？Every week 后面也不加s啊？

the Olympic Games are held once ___A every four years B .every four year C.every -four -year怎样区分呢?为什么B 不可以呢？Every week 后面也不加s啊？
选择A
b错在year后面是有s的
C没有这样的表达
every fourth year=every four years
这是一种固定用法
every + 时间段
例如：
every week这个楼主应该知道,是每个星期的意思
那么同样,只要把week换掉,意思也可以照搬：
every four years就是每四年一次的意思
是的,every week后部加s,因为every修饰的是week,算是一个集体,认为是单数,而其他一些[数词+时间]的形式,因为前面的数词大于1,所以就自然要s了

因为YEAR之前有four,是复数，every week中间没有数词，所以用单数。

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