He ( )run as fast as liuxiang before he hurt his left leg .单选can\could\can't\couldn't

He ( )run as fast as liuxiang before he hurt his left leg .单选can\could\can't\couldn't
He ( )run as fast as liuxiang before he hurt his left leg .单选can\could\can't\couldn't

He ( )run as fast as liuxiang before he hurt his left leg .单选can\could\can't\couldn't
could ( 根据 hurt 可知是一般过去时）

如果用couldn't
在他伤腿之前,他跑得不能和刘翔一样快

伤腿之前都不如,何况伤腿后呢?

所以用它就没有意义了