I called him but he didn't answer.为什么不用doesn't我打给他是过去式,他没有接我已经知道了,也是过去式哦,能再问一个不关于我问题的问题吗恩介词后面的名词能加复数形式吗比如one of the books?还有trouble和problem可数吗trouble不可数problem可数谢谢辣...
I called him but he didn't answer.为什么不用doesn't我打给他是过去式,他没有接我已经知道了,也是过去式哦,能再问一个不关于我问题的问题吗恩介词后面的名词能加复数形式吗比如one of the books?还有trouble和problem可数吗trouble不可数problem可数谢谢辣...