-How come a simple meal like this costs so much?-We have ________ in your bill the cost of the

如果in your bill 改为to your bill 便可以用added
add sth to...把.加到.add in 也有这词组，为什么不能用？add in 中的in 是个副词， 可是这里有宾语the bill如：If there is going to be a study group, please don't forget to add me in.要是成立学习小组, 别忘了把我算进去。 记住： “把。。。加到。。。。之中去”，必须是 add....to....比如：Add some salt to the soup.不可以说：Add some salt in the soup. 这是固定搭配