单句改错求讲解1This is the most expensive pen which I have bought.2

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单句改错求讲解
1This is the most expensive pen which I have bought.
2I will never forget the day which I first met you on the ship.
3This is all what I know about the mater.

which改成that,因为句子中出现了最高级,引导词只能用that.
which改成when,定语从句中缺少时间状语,所以用when
what改成that,因为what不能引导定语从句.（或者却掉all,也可以,这时候what引导的是宾语从句）

单句改错求讲解1This is the most expensive pen which I have bought.2 改错This is his the most expensive book he has bought.连词成句the, 连词成句.1、most,expensive,which,the,is,guitar,2、one,this,the,is, 定语从句改错：This is the most difficult maths problem which I have 英语单句改错1,this is the best film which has been shown this mont which is the cheapest/the most expensive? this is the computer which is the most expensive in the stor 1.Which is most expensive one between the three cars?(改错) this is the book which i bought yesterday This is the book that I bought it yesterday.改错求高人解答.改病句：1、this is the book which i bought it last year2、do This is the most beautiful city which/that I have ever visit