问题补充:
Have you returned the book to him ? Yes, I have returned it.
A. yet, yet
B. already, already
C. yet, already
D. already, yet
答案:
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。