He opened the door_____a knock.Much to his surprise,it was a long-separated friend

题目

He opened the door_____a knock.Much to his surprise,it was a long-separated friend
A.in addition to B.in favor of C.in response to D.in honor of

答案

选C
解析：Ain addition to “除了...之外”；B in favor of 赞成...;支持...;有利于...； C.in response to 作为对┄的回答,作为对┄的反应 ；D in honor of纪念...;祝贺...;向...致敬
很明显,ABD都不合题意,只能选C
翻译：作为对敲门的回应,他打开了门,令他感到很吃惊的是,门外是一个分开很久的老朋友