Have you returned the book to him ? Yes, I have returned it.
A. yet, yet
B. already, already
C. yet, already
D. already, yet
网友回答
A. yet, yet
B. already, already
(答案→)C. yet, already
D. already, yet
解析：yet和already都可以表示已经，还得意思，却别是前者用于疑问及否定句当中，后者用于肯定句当中。结合语境可知前文是疑问句，下文是否定句，故选C。