问题描述：
this machine doesn't work ,it hasn't worked f
this machine doesn't work ,it hasn't worked for years.
这裏可不可以用 isn't working 为什麼求解释.
this machine doesn't work ,it hasn't worked for years.
这裏可不可以用 isn't working 为什麼求解释.
问题解答：
我来补答展开全文阅读