KK asked Mrs.Zhou,"How long had you been like that?"
KK asked,"Mrs.Zhou,Had you seen a doctor?"
注意大小写和标点符号,Mrs.Zhou可以在前边,也可以在引号里边.楼下说的对，确实要把两个had改成have，因为康康当面问老师，不需要过去完成时，现在完成时就行了。当变成间接引语时，有个asked所以，要用过去完成时had+过去分词。