Mr. and Mrs. Black have a son, John.4/15 Mr. and Mrs. Black have a son, John.John is Mr. and Mrs. Black’s son.John is Mr. and Mrs. Black’s father.John is Mr. and Mrs. Black’s mother.John is Mr. and Mrs. Black’s parents.Giải thíchĐáp án A Dịch: Ông và bà Black có 1 người con tên John.