改错：Have you heard that Jeff's leg was broken while playing football?
问题描述：
改错：Have you heard that Jeff's leg was broken while playing football?
没看出语病~
答
Have you heard that Jeff's leg was broken while he is playing football?
应该这样吧,因为从句的主语是leg,所以while后面的主语不可以省略的,要不就变成leg is playing football了