how careless you both are!

how careless you both are! how careless _____!A.you both are 感叹句：what/HOW careless a boy you are! How careless a boy you are!这里哪个是主语? how clever you ___ A are both B both are how old are both of you? How careless you are to()the stove()while you're away!Really 感叹句：____ careless a boy you are!A.How 　　B.What a 　　C.What 18____ careless a boy you are!A.How B.What a C.What but many scientists are both care and careless you are careless .you should be ( )(thank) ____ careless a boy you are!答案给的是what啊 ,也有很多人选填how 的,