2017年属于什么年:once,twice,_____,______,______

once,twice,_____,______,______ MAYBE ONCE OR TWICE A WEEK once a week twice a week........ once bitten,twice shy的意思 ___行___效 一___水___ 兴___除_____ 无___有___ what occurs once in a minute,twice in a moment,and not once in a hundred years? what happens twice in eveny moment once in every munite,and never in a thousand year 有一首英文歌曲开头第一句为“Say it once say it twice” what happens twice in every moment,once in every minute,and never in a thousand years? What happens twice in every moment ,once in every minute ,and never in a thousand years?