fifteen-year-olds和a fifteen-year-old boy前者是指所有十五岁的青少年后者是指一个十五岁的男孩 后者如果把横线去掉是不是要变成a fifteen years old boy?那前者去掉横线呢?

fifteen-year-olds是什么意思? fifteen-year-olds看做单数还是复数? 初三英语语法题Do you think () should be allowed to drive?A.sixteen-year-old.B.seventeen-year-olds.C.fifteen-year-old.D.eighteen-years-olds Many parents don't allow their ----to go out at night.A fifteen years old B fifteen-year-old C fifteen-year-olds D fifteen-years-old选择什么?为什么? fifteen-year-olds和a fifteen-year-old boy前者是指所有十五岁的青少年后者是指一个十五岁的男孩 后者如果把横线去掉是不是要变成a fifteen years old boy?那前者去掉横线呢? Fifteen-year-olds shouldn't be allowed to drink.(改为同义句）____ ___ ____fifteen-year-olds to drin sixteen -year -olds和sixteen -year -old有什么区别 seven-year-olds Twelve-Year-Olds翻译 16-years-old和16-year-olds的区别 He is_______old.A.fifteen B.fifteen year C.fifteen years D.fifteenthhng six years old 和 six- year- old 和 six- year- olds的区别如题 16-year-old和16-year-olds和16 years old有什么区别? three-year-olds汉语意思 year olds还是years old? eight-year-old和eight-year-olds后一个加了s也对吗? 16岁的男孩们 英语怎么说sixteen-year-olds boy和sixteen-year-old boys哪个对?还有sixteen-year-olds对么？ Tom studies at our school.He is a ________ boy.A.fifteen-year-old B.fifteen-years-old C.fifteen year old D.fifteen years old