单选题 She looked everywhere for her book but ______ had to return home without it.

【正确答案】 C

【答案解析】词义辨析题。lastly意为“(列举时的)最后”；at the end意为“结束，穷尽”；in the end意为“最后，终于”。本句大意为：她到处找她的书但最终还是无功而返。