i have lost the key to the front door.请问to 怎么理解,还是什么固定搭配及翻译

i must have lost my key~不用have行不? I have to wait for my mother,for l have lost the key of the door哪里错了 I lost some(key) i have lost the key to the front door.请问to 怎么理解,还是什么固定搭配及翻译 Sorry,I can't open the door,for I ( ) the key to it.是填 lost 还是填 have lost 为什么? What has happened?What has happened?---I have lost my key and can't open the door.为什么不能用What happened?---I lost my key and i can't open the door.两者的区别是什么? Albert found the key.I lost the key yesterday.（合成一句） Albert found the key.I lost the key.(合成一句) Xiao Wang found the key.i lost the key yesterday变为定语从句 Albert found the key ( ) ( ) yesterday.Albert found the key. I lost the key yesterday.(合并为一句） Sorry,I can’t open the door,for I the key to it.A.lost B.lose C.had lost D.have lost此题为什么选A.而不选D呢? I have lost my key;I can't remember where I forgot it改错 What-------? I --------my key and can't open the door.A.happened;lostB.has happened;lostC.happens;have lostD.has happened;have lost选哪个?为什么? I can't find the key to my office,I( )have lost it on my way homeA would B should C must D ought to What did you do with your car?I lost my key,so I have to( )it in the park.A.lock B.repair C.leave D.pass i lost my key和i have lost my key有什么区别?分别是什么时态和意思有什么不同? the key to my door___.i have looked for it every where,but i still__itA is missing ;can't find B has lost ; don't findC has lost ; haven't foundD has been gone ; haven't found为什么选A He lost the key ____ the door