The door has been _________ since 9 o'clock.A.open B.opening C.to open D.opened到底是什么啊，说明理由。这三个答案怎么不一样？

单句改错：The door has been opened itself the door hinges has all been oiled to stop them_____. 是 I have been closed the door for 5 hours.还是 The door has been closed for 5 hours. 下面两句英语分别是什么意思?The door has been closed.The door is closed.具体语法分析? what has happened?I __ (lose) my key and can't open the door 句型转换The dog has been dead for a week.A week __ __ since the dog __ . USA has been independent since the year __.The first president was __.Now the president is ___. Push the door hard,it will open.__ __ push the door hard,__ will open. He has been to America.对America提问. __ __ __ he been __? The technician __ to find out what is wrong with the generator.has trying has been trying the work has been __ finished.为什么要填nearly?而不填almost?谢谢. The __ (invent)has been to many countries.横线添什么最好翻译一下 Two thirds of the composition __ been corrected.此题用has还是have 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? please __(help) him __(open) the door 6------.what ___ the notice __?--------it___,No parking.6------.what ___ the notice __?--------it___,No parking.A.has said ,has said B did say ,said C.has been said,has been said D.does say ,says He has been a soldier for 5 years.（改为同义句） He has __in the army __5 years __. 关于被动语态的表达“门开着.”这个句子是翻译成：The door open 还是the door is opened?“商店已经开业了”是翻译成The shop has opened还是The shop has been opened?