英语竞赛201241.If something happens once in a blue moon.How often does it happen?A.Occasionally B.Very rarely C.Only once D.Often 选什么为什么?

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英语竞赛201241.Ifsomethinghappensonceinabluemoon.Howoftendoesithappen?A.OccasionallyB.VeryrarelyC.Onlyon

英语竞赛201241.If something happens once in a blue moon.How often does it happen?A.Occasionally B.Very rarely C.Only once D.Often 选什么为什么?
英语竞赛2012
41.If something happens once in a blue moon.How often does it happen?
A.Occasionally
B.Very rarely
C.Only once
D.Often
选什么
为什么?

英语竞赛201241.If something happens once in a blue moon.How often does it happen?A.Occasionally B.Very rarely C.Only once D.Often 选什么为什么?
选择B
once in a blue moon
adv.千载难逢地；俟河之清；百年不遇
形容极少的

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