for 15 years,the united nations has been ___"world water day"A congratulating B inspecting C observing D watching the answer is C.TELL ME WHY

英语翻译for the last 20 years The Smiths ______ Beijing for years. the story happens for three years 英语翻译The printing industry in theUKis characterised by a largenumber of very small firms,and the case study organisations reflected thiswith six having less than 25 employees.The industry has undergone majorchanges in recent years as trade uni you are the uni que of my whole He saved money for years 和 he saved the money for years 这个the到底有么有 the man hiccupped for 69 years 为什么用for? 问问这个微观经济的题Refer to Table 10.1,which shows the relationship between the price that Gladys charges for aproduct and the quantity of that product that Gladys sells. The marginalrevenue that Gladys receives from selling the fourth uni My father worked in the factory for three years.(对for three years划线提问) I have had the bike for ten years.I_______the bike for ten years ago. He lived in the city for ten years for ten years 画上 提问 I moved to the country ___over 15 years,A of B for C on D to He has worked in the company for 15 years.H ( ) ,he,doesn~t 英语翻译stress cycle number curves based on uni-axial fatigue tests constitute a classic possibility for the lifetime prediction of parts or tool elements.uni-axial fatigue为单轴疲劳,重点是把a classic possibility很好的翻译出来 We‘ve been working hard for the last five years.中the last有什么作用?for the last years与for five years有什么不同? for the last few years和 in the last few years的区别 同义词转换The factory opened twenty years ago.The factory ( ) ( ) ( ) for 20 years. in the past 5 years 跟 for the past 5 years RT