My brother is a student in（ a ）university.为什么不用an呢?

A baseball is ( )my brother. writing my a letter brother brother is( . )连词成句? My little brother is a c______ boy. My brother is a computer e____填词. This is my sister a什么that is my brother? I love my brother I've a brother.He is a good brother. my brother is [tall] my mother has a brother ,he is my u------- My brother is two months old.He is a( whose book is this?It's( ).A my brother' s friend.B my brother friend's .C my brother 's friend's.D my brother friend. My brother is a doctor.[就画线部分提问】画线是My brother My brother is a w___,He works in a restaurant. my brother is a waiter.he works in a r . My brother is a student.I'm a student,______ my brother is a w[ ]in a hotel Jake's father is my mother's brother.Jake is my___________ A brother B uncle Ccousin He asked me how my brother was.=How____?he asked.A Is your brother B your brother wasC Your brother is D Was your brother Ben is a friend of______.A.my brother B.bBen is a friend of______.A.my brother B.brothes C.my brother's D.me