请问Who sings the best in your class?句中的sings为什么要用复数形式.

请问Who sings the best in your class?句中的sings为什么要用复数形式. --Who sings best in your class?--Mary___________ 初三英语：Who sings best in your class?Kate ___ 空格处为什么要填did? who sings best in your class 怎么回答 jenny sings the best in her class保持原句意思 jenny sings ___ ___ Who( )( )( )sings the best in your class?空应该填什么?含义是你认为你们班谁唱歌 Bill sings best in our class为什么best不加 the Jim sings best in his class同义句转换要两句 Kate sings best in her class改为同义句 Jim sings best in his class .同义句转换 joan sings best in her class Mei Mei sings best in our class（改同义句） Mei Mei sings____ ____