There used to be a clean river.为什么不是There used to have a clean river

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• the company had about 20 notbook computers but only one- third __were______ used regularly.Now wethe company had about 20 notbook computers but only one- third __were______ used regularly.Now we have 60working all day long.为什么用过去时,不是regularly经常吗,我觉得应该是现在是
• the company had about 20 notbook computers but only one- third ________ used regularly.Now we have the company had about 20 notbook computers but only one- third __were______ used regularly.Now we have 60working all day long.为什么用复数?不是小于一吗
• 英语翻译Do you know that humans have been cleaning their teeth for over 7,000 years?According to the BBC,the Ancient Egyptians used a type of toothpaste (牙膏).___21____ it is believed that the Egyptians used a finger ____22____ a toothbrush to clean their teeth .Chinese people may have ____23____ the first toothbrush around 1,600 BC.Your toothbrush,however,may have also become____24___ .Because it is now possible to clean our teeth ___25___ using our hands
• There used to be a clean river.为什么不是There used to have a clean river
• there used to_(is)a clean river before.
• There used to be a clean river.为什么不是There used to have a clean river
• 几句英译中.the girls are excied to see Jay zhou.show me how to operate the machineI'll have someone shorten my dress by two inches.It enables people to live an enjyyable life.they oughtn't to be late for schoolpeople used to clean their rooms by handthe electronic dictionary was very usefultom is the same weight as timshe is so efficient a girlher boss is very pleased with heryou'll have to have a medical examthe internet has brought as a lot of fun
• The only thing I can do is (to) do it alone.为什么不能要括号中的to?We have no choice but (swimming) across the river.为什么要用原型而不能用ing形式?I'm looking for something which to clean the curtain.哪里有错?为什么要这么改?
• 1、Have you decided which one [buy].2,The boss made the workers [work]eight hours a day.3,Don't keep me [wait]for a long time.4,I am made [clean]the classroom this week.5,Students can form [group]of five to discuss this problem.6,Our village looks beautiful [especial]in spring.另外有个语言点：That is perfect for you to get up early in the morning.[开头为什么用that 而不是用it ]
• 英语单词造句!不用长!请用 feel spell write down join find miss be afraid of used to have to worry aboutfinish allow choose need clean up 来造句!就每个单词造一句话就可以了!好的我会追加分的!
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