Mr. and Mrs. Black have a son, John.12/15 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 đúng:A Dịch: John là con trai của ông bà Black.