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