once
once four year 四年一次
~~~~~~~~~~～～~~~~祝你進步,如對你有幫助,請及時采納~~~~~~~~~~~~~~~~為什么不能是every four years？every four years每四年放到句子里,這樣這個句子意思就不通了句子意思是 他們生日每四年才有一次
their birthdays only come _____ four years是填each,every還是once
their birthdays only come _____ four years是填each,every還是once
英語人氣：752 ℃時間：2020-02-03 12:45:44
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