It has been used to detect gold which has been buried in the ground.请问gold前面为什么不加the为什么ground前面有the这俩个词在前文中都没有提到.这是新概念英语2册5课原话.

has been used to detect gold,这是什么时态?句中的used to 是表示过去常常做某事吗?A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.这句中的it has been u I have been used to it. We have been used to it sadly it has been used和it has been in use有什么区别吗 which 后面为什么还用has been 这个时态,我认为应该用过去完成时A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground. 选择：Every possible means ( ) to prevent the air pollutionis used?are used?has been used?have been used? the house where i used to live has been knocked mr green has been used to jogging_________ ( day) We used to be forgetting .And everything has been done.When you remembered it,time wnet by.Everything has become memory,you ,are the core. 英语翻译Every possible means____to work out the problem,but it is too difficult for usa.is used b.are used c.has been used d.have been used 一道新概念二选择题Roy Trenton_____________a bus.A.has been used to drive B.has been used to driving C.has used to drive D.has used to driving 英语翻译My heart has been used to I oniness perhaps it is not so bad to live in your heart （这句中文翻译） My grandpa in Shanghai though he in the northMy grandpa in Shanghai though he in the northA.has been used to the life,used to liveB.has been used to live,used to livingC.has used to live,used to liveD.has been to living,used to the life What has to be broken before it can be used? what has to de broken before it can de used? What has to be broken before it can be used?What has to be broken before it can be used? we do not know when man first began to use salt,but we do know that it has been used throughout his这是什么意思! He has been used to walking to school为什么 to 后面可以跟ing形式?