Lucy has been chosen to be the moniter by her classmates改为主动

The computer has been checked by tom.（改为主动语态） Has she ever been known to lose the work?改为主动怎么说,急. Mary____(be) always kind to her classmates.Shanghai has many The letter has already been sent to her brother by her.为什么al Bcause she has been laughed at by her classmates句中为什么要跟上at? My book has been kept for 10 days by Tom.改为主动语态 Lucy has tried her best to improve her grades.But by no mean The computer hasn’t been rapaired by the workers.改为主动句 把“The computer hasn't been repaired by the work .”改为主动语态 The wallet must have been found by one of the villagers改为主动句 We have chosen him to be the host of a charity show.(改为被动语态） how long have the computers been used by you?改为主动