My brother is a football fan,-----------A,so is I B so is my c ,so is mine D so mine ,答案是第3个,可是为什么啊

A baseball is ( )my brother. 对划线部分提问:1 The boy (in a red shirt )is my brother 2 Li Lei goes to work (on foot). 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. My brother always goes to school on foot.My brother goes to school on foot( ) ( ) () 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] How_____your brother go to school?My home is _______．_________he goes to school on foot,_______he ______by bike． my mother has a brother ,he is my u------- My brother is two months old.He is a( I go hike with my brother on foot everyday. 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,______