the machine has been used for several years.It needs repairing.最后为什呢使用动名词形式呢?修不应该是被动的吗?

英语 the new machine has been tested the machine has been recovered this The price of this washing machine has been increased -------15%. the machine () satisfactory after being testedThe machine __ satisfactory after being tested.A has proved B has been proved C has been provenD is prove 选哪个?为什么? 912- the computer has been removed the machine cover has been removed simce last system start up-pl the machine has been used to detect gold.the machine has been using to detect gold.the machine has been used to detect gold.the machine has been using to detect gold.这两句话所表达的意思一样吗 语境分别是什么? 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. 英语翻译912-the computer has been removed ,the machine cover has been removed since last system start up.please ensure that any system access was authorized. the computer has been removed the machine cover has been removed since last systemstart up please ensure that any system access was authorized a new machine called the revealer has been invented.请机器不是被叫作吗,那不是应该a new machine was called吗,为什么没有was, It ___be two years before they find the new kind of machine.A.will be.B.has been the company has been producing this model of machine tool( )2008.A.since B.after C.fpr D.before qui cktime has not been detected on this machine. 英语单选：The machine has been repaired three times since it____into use.A.had come B.has come C.came D.comes 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 A new machine called 'The Revealer' has been invented这句英语怎么理解.主.谓called 'The Revealer'是过去分词短语吗 this machine ____ specially ____to using underwater A.has been :adapted B.has been :adaptingthis machine ____ specially ____to using underwater A.has been :adapted B.has been :adapting C.was :adapting D.has:adapted What's that noise?-oh,i fogot to tell you,the new machine ___A.was testedB.will be testedC.is being tested D.has been tested