fifteen是什么意思,fifteen52

olds=fifteen-year-old student 可以理解这样 不然选a就意思残缺
pep小学英语三年级下unit6howmany课件课件整理.ppt
必修一第四单元earthquake_练习题答案ppt
identifying numbers 5:15 a quarter past five/ five fifteen 5:45
a fifteen– year—old american boy an eight– year– old boy he