She looked everywhere for her book,but_had to return home without it .

问题描述:

She looked everywhere for her book,but_had to return home without it .
A.lastly,B.at the end
答案给的是B,A为什么不对?
这两个都表示最后,都可以做状语啊,为什么只能用词组的?

at the end实际是不对的啊,只有at the end of ...,没有at the end的.