Must I return the book this week? No you. You can it for 20 days.A. mustn’t keepB. need

问题补充：

Must I return the book this week? No, you. You can it for 20 days.

A. mustn’t, keep

B. needn’t, borrow

C. needn’t, keep

D. mustn’t, borrow

答案：

A. mustn’t, keep

B. needn’t, borrow

(答案→)C. needn’t, keep

D. mustn’t, borrow

解析：以must开头的一般疑问句的否定性回答要用needn’t或don’t have to。在表示借某件东西多久时要用keep。因为borrow是非延续性动词，不能跟段时间状语连用。