at the end 通常和of连用构成介词短语,at the end of意为“在……结束时、在……的尽头”,可用以指时间或处所,强调一段时间的结束点或某段路程的终止处,例如: Our school held a sports meeting at the end of last year.去年年终我校举行了一次运动会. in the end意为“最终、最后”,与at last 或者finally同义.例如: In the end they caught the thief.最终,他们抓住了那个贼. 简单地说,at the end后要加of,而in the end是固定短语,所以选in the end 啦