为什么open变为延续性动词时要变成have been open 而不变成have been opened?

为什么open变为延续性动词时要变成have been open 而不变成have been opened? open变延续性动词是have been open还是have been opened?总觉得两个都行如果两个都行,那有 They have never been opened.为什么不可以是They never have been open 急 been open还是has been opened 请问have been to是不是延续性动词 现在完成时有没有have been这种结构?后面若要跟动词,动词变成什么形式>? How long has the shop__.A,been open.B been opened 答案是B为什么 has been opened和has been open的区别. has been open 和has been opened区别? keep your eyes 为什么不填opened,而填open have been in可代替哪个非延续性动词 How long have you been living in China?为什么要用been,living是延续性动