问题补充:
Have you returned the book to the library ?
--- Yes, I have returned it.
A. yet, yet
B. already, already
C. already, yet
D. yet, already
答案:
A. yet, yet
B. already, already
C. already, yet
(答案→)D. yet, already
解析:句意:---你把书还给图书馆了吗?---是的。我已经还了。yet常用于现在完成时的否定或疑问句中, already用于肯定句中。结合语境可知选D。