问题补充:
------- you the book to the library yet.
------ Yes. I have.
A. Have ,returned,/
B. Have, returned, back
C. Did return ,/
D. Did, return,back
答案:
(答案→)A. Have ,returned,/
B. Have, returned, back
C. Did return ,/
D. Did, return,back
解析:根据答句Yes,I have 推测应选用助动词have;归还sth 可以表达为 return sth to……或者 give sth back to……