Question

 — Mum, must I stay there the whole day?

— No, you____________. You____________come back after lunch, if you like.

A. mustn't; can       B. needn't; must       C. needn't; may

Answer 1

C

【解析】选C。考查情态动词的用法。由must引导的一般疑问句表示否定回答时需要用needn’t或don’t have to；表示答应准许某人时情态动词可以用can或may。故选C。