Football players should _train hard______ to improve their skills.(对划线部分提问)
问题描述：
Football players should _train hard______ to improve their skills.(对划线部分提问)
Football players should _train hard______ to improve their skills.(对划线部分提问)
_____ _____ football players ______ to improve their skills?
划线部分是“train hard”.
答
【What】【should】 football players 【do】 to improve their skills?
足球运动员怎样才能提高他们的技巧?