or and的一道题Eatting.drinking.___smoking____not allowed.为什么答案是or ,is

or and的一道题Eatting.drinking.___smoking____not allowed.为什么答案是or ,is ·一道不太懂的英语题Nobody but doctors or nurse and those______by Dr,hu_____to enterthe patient's room.A invited ;is allowed B are invited;are allowed C being invited;allowed D invited;are allowed应该选哪个?为什么/ 祈使句and变or吗?我们考试的时候有一道这样的题 Don't eat _____ shout in the hallways,是and还是or啊? 一道英语连词填空题.She got home and ate ( ) drank nothing. A. and B. or 有关偏导数的一道题的一个问题,..（偏导数的符号不知道怎么打,就用导数符号代替了)设x=rcosθ,y=rsinθ,函数f(x,y),则df/dr=df/dx·cosθ+df/dy·sinθ--------------------(1)而df/dx=df/dr·dr/dx ,df/dy=df/dr·dr/dy----- Nobody but doctors or nurses and those by Dr Hu to enter the patient’s room.Nobody but doctors or nurses and those invited by Dr Hu____________ to enter the patient’s room.A.is allowed B.are allowed and or的一道改错题!in exams and in certain kinds of written work,it is dishonest to help or to ask for help from others.答案是把第一个and改为or.in exams or in certain kinds of written work我想不通,这里and也可以啊! or 和and 的区别?如题 I usuall have porridge ,noodles.rice noodles .bread or buns for breakfast .为什么这里要 oI usuall have porridge ,noodles.rice noodles .bread or buns for breakfast .为什么这里要 or 用而不是and?不是否定句才用or的吗?I usually dr Dr.wang 中的Dr的全称 .more fruit and vegetables to keep healthy.A.eating B.To eat C.eatting D.eat 英语关于篮球的完型填空 0 0 Dr James A Naismith invented basketball in 1891.He wanted a game that people would play inside or o----- ,in the daytime or at night and that was easy to learn and very exciting to w------ .The winning team would dr开头的单词? 有dr的单词 Dr.的意思 dr的缩写是什么意思? 我想问问一道英语题,题目是这样的;Why was Dr Sun Yat-sen so important to China?列出至少三个理由, work for 和work on的 区别 附加一道题 注重过程 求解Dr wang has been working __the experiment for the whole evening,and he is still continuing ___the experiment after a 20-minute break.A.with, to prepare for B.for ,preparing C .on, pre