— Must I return the book this week? — No you . You can _it for 20 days.A. mustnt: keep B

问题补充：

— Must I return the book this week?

— No, you . You can _it for 20 days.

A. mustn : keep

B. needn ; borrow

C. needn ; keep

D. mustn ; borrow

答案：

A. mustn : keep

B. needn ; borrow

(答案→)C. needn ; keep

D. mustn ; borrow

解析：must回答与延续性动词的用法。Must开头的一般疑问句的否定回答用“……needn’t”, 由答语for短语指一段时间，故用延续性动词，borrow为短暂性动词，要换成延续性动词keep。