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:yet和already都表示 “已经”之意,通常用于完成时态。yet 用于问句或否定句,位于句尾;而 already 用在肯定句里,位于句中,即be动词或助动词之后,行为动词之前。故本题选D。