don not talk and laugh loudly in class为什么不用or

don not talk and laugh loudly in class为什么不用or "Don't talk and play in class"为什么用"and"而不用"or"? 否定祈使句连词是and还是or 如：Do not talk (A.and B.or) eat in class. Would you please class, boy? A. not to talk loudly in B. not Don't talk loudly ____make any noise.A.and B.or The students___that they must not talk loudly in class A.are Don't talk loudly in the hallway. Don't talk in class,boys and girls,_____? Please remember ____ in class. A don't talk B not talk C not Don't talk loudly. daniel,(not talk )in class ______(not talk) loudly.