how old -----w------this twins last year

how old -----w------this twins last year Last year some scientists w什么 to find out if this old saying How old is dad?Son:dad,how old are you?Dad:last year's age p How many students were__to this university last year答案是什么 peter was ten years old last year .How old is he now?He is （ I am seven years old this year,so I _______ six last year. How old are the twins改错 last year at this this is an old ____ of my family which was taken last year two( )twins. A. nine-years-old B. nine-year-old C. nine year 英语首字母.I am eighteen years old this year.I w 1 a pupil before 要正确的!I am eighteen years old this year.I w 1 a pupil before