The book has been translated into thirty language since it c

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The book has been translated into thirty language since it came on the market in 197
came 能不能改成had come .理由?

不可以
原因：一、若since引导的状语从句的谓语动词是非延续性动词的过去时,则从句表示的时间是“从动作开始的那一时刻起”.如：
He has studied very hard since he came to our school.自从他来到我们学校,他学习就非常努力
came是非延续性动词.不能用完成时态,因为非延续性动词不能表示延续性动作

The book has been translated into thirty language since it c The book has been translated into thirty language since it _ the book has been translated into thirty languages since it the book has been translated into thirty language 24.The book has been translated into thirty languages since 1、The book has been translated into thirty languages since i it is said that this book ---- translated into many language The book must have been translated into English three years It is said _____ has been translated into French. The book is said to have been translated into several langua The book is believed to have been translated into English．= It is said _____ has been translated into French A.that that