I can't go.Because I have so many things--a,done b,to do c.to be done答案为什么是b为什么不可以选a选c呢被动语态不对吗

Because I can't go out on school night. i can't go i can't go with you because i am working.换成同意句怎么换?i can't go with you because i am— — 英语 对括号部分提问I can't go to school( because I am ill) i can't go to the movies because i have to do c_____ I can`t go shopping with you ,because I have to s__ for the test. I'm sorry I can't go in because Ilost the key to the door改错. I can't go home now because i leave my k（） at home. Sorry,I can't go shopping with you because I'm too b____now. I can't go with you because I have to b_ my mother.请补全单词 I can't go to de cinema .Because I ( )my ticket 用lost 还是 have lost I can't go on working because I'm so tired.同义句 I can't go on working ____ ____tiredness. I can't go on working because I'm so tired.同义句 I can't go on working ____ ____tiredness I am sorry I can't go to my friend's party,because I am b_____ my little brother tomorrow 改错I'm sorry I can't go in because I lost the key to the door.有一处错请改正 i don't think i can go to school by myself because I am not me还是myself? I like s____ because I can go swimming 改同义句：I can't go out because it is rain.I can't go out _____ _____ the ____.