My brother college for over three years.为什么用括号中的.有这种用法吗?我也认为是have been in 但答案是这么写的，是不是答案错了？

my brother has been ( ) college for over three years .填介词in 还是at My brother is a college student.He studies at Beijing U____.根据首字母 填空 I am studying___a college.My brother works___a university.用介词填空怎么填? My brother wants to go to college ____high school .中间应该填什么介词?为什么? 我哥哥正在大学主修英语 My brother is ( )( ) physics in college 填一下空 My brother wants to go to c____________ when he grows up八下.第一单元吧、、1.college my college move My College什么意思 Well,my father （ ）【visit】my brother at college.But my mother and l（ ）【be】at home.用be going to Oh my brother Oh my brother shar 请把下列单词组成一个逻辑清晰合理的句子My is bother twenties goes to in Arizona college his and请注意,是bother 不是brother My brother does well in all his lessons.His wish to become a college student is sure to come out.为什么?为什么用come out不用come true l am studying ____ a college.My brother works ______ a university.A.at,in B.in,at C.to,in D.at,to 英语作文 my ideal college My brother?last year MY young brother 英语作文 my brother My dear little brother：