Who's girl in yellow?She's my sister.(改错)急……

Who's girl in yellow?She's my sister.(改错)急……
Who's girl in yellow?She's my sister.(改错)
急……

Who's girl in yellow?She's my sister.(改错)急……
girl 前面加the 或者that

Who's that girl in yellow? She's my sister.

Who's the girl in yellow

Who's (the/that) girl in yellow? 这里的girl是特指那个穿黄衣服的女孩，故要用定冠词