I___to my brother since last summerA.didn`t write B.hadn`t w

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I___to my brother since last summerA.didn`t write B.hadn`t written C.haven`t written D.don`t write
为什么,

有last summer,肯定不是一般现在时的D
因为有since,就是从什么时候,所以指的不是过去某个时间点,所以不用一般过去式A
答案B是过去完成时,这个主要指过去的过去,比如说昨天我就完成了什么,句子中就一个时间,提现不出过去的过去的意思
所以答案就是C,现在完成时,指从某个时间点一直持续到现在的动作
再问： last summer不是过去时吗，since不是完成时吗，难道不是过去完成时
再答： last summer如果单独出现的话，就是指某个时间（时间点），当然就是过去时 since就是从什么时候到现在，就是完成时但是并不等于它们两个加一起就是过去完成时了…… 过去完成时是指过去某个时间里已经完成了的事情，比如说我昨天就完成了什么，I had finished it yesterday. 而题中可以可以理解，是想说的是，自从夏天开始到现在我都没给兄弟写信，并不没体现过去就完成了的意思，所以这里是现在完成时

I___to my brother since last summerA.didn`t write B.hadn`t w I___to my brother since last summer.A.didn`t write B.hadn`t I（）to my brother since last summmerAdidn't B hadn't writter 高一英语练习题 He ___ to me since last month.A.didn't write B.hadn' 98 Don't use that pen.It___smoothly.A.didn't write B.don't w 1.I didn't go to bed--[since,until]my mum came back last nig hadn't have和didn't have hadn't he和didn't brother,didn't,his,my,do,homework,night,last,的连词成句? last year he didn't （）any letter A、wrote B、writes C、write D、 Little Tom________.Don't wait for him.A didn't come B hadn't 1.My teacher______at school last Friday.A.didn't B.wasn't C.