since then,i _________ more and more differences between chinese and us cultures填discovered 还是have discovered,为什么

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since then,i _________ more and more differences between chinese and us cultures填discovered 还是have discovered,为什么
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since then,i _________ more and more differences between chinese and us cultures填discovered 还是have discovered,为什么
since then,i _________ more and more differences between chinese and us cultures
填discovered 还是have discovered,为什么

since then,i _________ more and more differences between chinese and us cultures填discovered 还是have discovered,为什么
have discovered,有since的句子里应该用完成时,也就是have+分词.
另外,us是不是改成our更好~

I have lived here since then还是I have been here since then对啊? Please come again in 30 minutes.I'll finish it then.Please come again in 30 minutes.I’ll finish it _______ then.A.at B.until C.by D.since急用啊!~~~ 求翻译I have been going regularly ever since then. But then /Before then / Since then/ Until 翻译：ever since then ever since then since then &since whenThe book was written in 1946,_______ the education system has witnessed great changes.A.since when B.since then 为什么选A不选B? I began to study English in 1985.用since改写I ______ _______ English _______ 1985. Since I am not put.Then I will not go to.Because I love you. 英语在线等··I have added three times more since then翻译··I have added three times more since then since then可以说成 since that time 从那以后是from then还是since then? The book was written in 1946,_______ the education system has witnessed great changes.A.when B.during which C.since then D.since when Since then ...every time once it is raining I will think about you. Since you do not know who I am,then please do not bother Bob said to me I have written many books since then改为间接引语 I ()(buy) the book three years ago and ()(keep)it since then适当形式填空 since then 是啥意思?