--- Must I return the book this week?
--- No, you ______ . You can ______ it for 20 days.A.mustn't: keepB.needn't; borrowC.needn't; keepD.mustn't; borrow
网友回答
C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。