Keys are used by people （for/with/to opening) the door.哪个对?

Keys are used by people （for/with/to opening) the door.哪个对? keys are used for ____(锁) the door如题 Where are () (they )keys Whose keys are these? Keys ( ) opening the lock in the door.Keys ( ) opening the lock in the door.A.used for B.are used C.are used to D.are used for我选的是C老师给大答案是D be used to doing不是被用来做某是吗,我查词典查不到be used for? keys are user by people （for/with/to doing) the door哪个对? many kinds of drugs are used by athletes competing in by used by Today computers ? by many people at home.use are used be used 填什么 whose keys are these?they are y什么 keys. people（ are used ,used,use,were used）to crossing the river by ferry选哪个好,为什么 Now where are my keys? ______(it) are my keys. are the engine power keys Computer are used () people () doing problems.A.for,for B.for,by C.by,for D.by,in 1The computers are used widely by people 这么写不行吗?the computer are widely used by people为什么这么写呢 be used by 解道英语题!谢谢!说明原因!. The children everything by themselves when they are alone at home. A. used to doing B. are used to do C. are used to doing D. used to do