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It is 5 years since I have lived here.It is 5 years since I lived here.这两句话分别译为? 英语

数列{an},{bn}中,a1=2,b1=4,且an,bn,an+1成等差数列,bn,an+1,bn+1成等比数列（n∈N）在数列{an},{bn}中,a1=2,b1=4,且an,bn,an+1成等差数列,bn,an+1,bn+1成等比数列（n∈N）求出{an}, 数学

bn}的通项公式后证明：1/

已知数列{an}和{Bn}满足a1=2 an-1=an(an+1-1) bn=an-1 n∈N+已知数列{an}和{Bn}满足a1=2 an-1=an[a(n+1)-1] bn=an-1 n∈N+（1）求Bn通向公式（2）设Cn=B(2n-1)B(2n+1) 求使得C 数学

+C2+.+Cn< （M/1

他什么时候离开的?刚刚离开.when（）he( ) here?he ( )here just now 英语

My home is two kilometers away from here.这里的away from 是什么词,from 遇见here为什么不省去英语

They will be arriving here tomorrow.为什么用be arriving,如果改成They will arrive here tomorrow.可以吗英语

She( )be here now because she has just gone toShe( )be here now because she has just gone to New York.填can't还是may not 英语

May I have a look your pencils?C() Here you are.May I have a look your pencils?C() Here you are.英语,期中考内容,填一个C开头的单词英语

I have been here 与I have been living here一样吗?有点弄不清楚. 语文

I have been sitting here for three hours.我在这坐了三小时.可否说成I sat here for three hours?也就是去掉have been,把 sitting改成过去式,意思是不是一样? 英语

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