单项选择题 You ________ clean that room. It is very clean now. A. must B. have to C. need to D. don’t need to

未知题型 In paragraph 1, 'both sides of the Atlanti' probably refers toA.the United States and United Kingdom.B.the European and American.C.the North America and EuropE.D.the North American continent and the British Isles.

未知题型 商务会议的功能的有分享信息、探讨问题、交流经验和