st petersburg is very beautiful city.it was once called leningrad. the soldiers moved the boxes to a mine.they wanted to hide them. shananxi province is a place with many cultural relics.they are well looked after. here are the farmers.they discovered the underground city last montih. 把这些句子改成定语从句。然后说明,为什么不用限制性的而用非限制性的或为什么用非限制的不用限制的。每句都要。 - -最后说下,这种合成定语从句的句子,要怎么看他要弄成限制的还是非限制的。举些好点的例子来看看。 别上百度查!百度我都看过了!