must/mustn't表达行为规范 — 英语选择题
题目
在图书馆里，我们应该怎么做？下列哪句话符合图书馆的行为规范？A. We must talk loudly, and we mustn't read books. B. We must keep quiet, and we mustn't eat snacks. C. We mustn't read books, and we must run. D. We must eat snacks, and we mustn't keep quiet.