She talks as if she had been there before是什么从句

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• 定语从句 英语she brought with her three friends,none of whom i had met before .
• --- Alice came back home the day before yesterday.--- Really?Where ______?选项:a、has she been b、 had she been c、 has she gone d、had she gone 选哪个?这是什么倒状语法?帮我分析一下
• 1：how can he get good grades____he won't study?我填AS,想用作原因,而答案给的WHEN,我猜想可能是用做既然表条件,我觉得这样的话答案不如我的准确,还是有别的原因?2：Three years had passed _____ i knew iti:since;answer:before 3:Nancy enjoyed herself so much ____ she visited her friends in Syeney last year用WHEN 还是 WHERE?有时整个从句修饰主句既可以用作表示时间状又可以表地点状,连词怎么样用?4：MY ENGLISHI teacher 'humar was ____ make every student burst into laughterans:such as to；SUCH AS还能连用吗?我只知道结果状有SO THAT,SO.THAT,SUCH.THAT,请问SUCH AS 是什么用法?5：经
• 1.It seems oil____ from this pipe for some time,we will have to take the machine apart to put it right.A.had leaked B.is leaking C.leaked D.has been leaking2.She waved to the bride before talking her seat at the back of the church.Before she ____________________________________.3.They are interested in testing the effects of contemporary music on different people.( appeal to ) _____________________________________.4.I feel very guilty ,because I have
• 几道定语从句的选择题36.Do you know the girl _____necklace has been stolen?A.her B.which C.that D.whose37.When she came back from London,she told us about the schools and teachers_____ she had visited.A.who B.that C.which D.where38.Who is the boy ______is speaking there A.whom B.which C.that D.who39.David is one of the foreign teachers who_____ in China.A.is working B.works C.has worked D.work40.David is the only one of the foreign teachers who_______ in our cou
• 1.It is in the mall _ her purse had been sliced open _she was robbed of her necklace.A that,where B where ,that（答案是B,我知道一个是强调句,一个是定语从句,但为什么一定是前一个是定从,后个是强调句?为什么不能选A）2.Mary _ all the housework ,she dropped herself into the sofa.A having finished B finishing(答案是A,为什么不能选B,
• 这个是什么类型的虚拟语气if she would have been playing the game,she would have had both boys on her team
• 讲解两道英语单选Ever since picasso painting went on exhibit,there__large crowds at the musemevery day.1.is B has been C.have been D are逗号后面的句子在整个句子中作什么成分?还有这个是主谓一直是吧,have been 如果放到句子中表什么意思?2.____in the trafiic accident that she had to be sent to the hospital.A So seriously Rosa was injured B So seriously injured was RosaC So injured seriously was Rosa D So seriously injured Rosa was.这个是考so...that..引导的结果状语从句么?该题涉及哪些知识内容
• 英语翻译My parents had been talking about my going to school for weeks They talked about school in a way that make me worry that I would have a good time there so when the first day came I was not afraid  I woke up early before me mother called me My mother had some new clothes for me and she make sure that I looked nice that day .She made breakfast for me and then I went to that  At the school I met the teacher.but I connot remember her name I do know th
• 一道有关宾语从句的选择题Did you ask the teacher ＿＿＿＿ the day before?A. what was happended to herB. what she had happenedC. what she happenedD. what had happended to her请说明理由.
• O2 和N2 的混合气体共0.5 mol,质量为 O2 和N2 的混合气体共0.5 mol,质量为14.8g,则其中含O2 _______________g,含N2 的物质的量为__________________.
• 平均摩尔质量为7.2g/mol的N2与H2组成的混合气0.5mol通入一恒容密闭 容器中,一定条件下发生反应,平衡时容器内压强为反应前的76%（1）反应前混合气中N2和H2的质量比为（2）平衡混合气中,含氮的体积分数是3）平衡时N2的转化率是