Question

---I am afraid I can't finish the book within this week.
---______

1. A.
   Please go ahead
2. B.
   That's all right
3. C.
   Not at all
4. D.
   Take your time

Answer 1

D
go ahead“继续干吧”；That's all right“没关系；不用谢”；Not at all“别客气，没什么”，对感谢的回答；take one's time“要用多少时间就用多少时间；不着急”。由语境可知，应选D项。