We must not eat or drink in the library.为什么要用or?

We must not eat or drink in the library.为什么要用or? We must not eat or drink in the classroom. (must not eat or we must not food or drink in the classroom. do not eat or drink in the classoom=you?eat or drink in the You must not eat or drink in the libary.哪些英文是错的. We must eat or drink in the classroom.改为否定句怎么改 students and teachers do not eat or drink in the We must not eat（ ）drink in the classroom. We can not ------,-------,or listen to the music in library You must not eat or drink in tile reading room.(祈使句)_____ __ We must study English hard or we can't be in the library,(反义 drink not or eat in class 哪里错了