He didn't go to sleep ______he finished his homework.C. aHe didn't go to sleep ______he finished his homework. A. till B. before C. after D. until 选什么,为什么,有什么区别?

He wanted to go to Beijing,didn't he? 改错1.He didn't go to the cinema yesterday.and I didn't go,too. he didn't go to school because he wan ill 同义句he didn't go to school____ _____his_____. He didn't go to school because of ______(sick). He didn't go to school on those days. Tom didn't go to school because he didn't feel( Tom didn't go to school because he was ill.Tom didn't go to school because of__ __. He didn't know where to go 还是where he go,原因呢? He didn't go to work because he was ill.(同义句)→He didn't go to work because of _____ _____. he didn,t go to school yesterday（）he was ill. beche didn,t go to school yesterday（）he was ill.because of还是because为什么? He stayed at home last night.He didn't go to the cinema.(保持原意不变) he didn't go to school because he was ill(改成同义句) he didn't go to school because he was ill yesterday(改为同义句) he didn't go to school .because he is _____(terrible) ill He didn’t go to France ,the doctor suggested that he ______ there Because he was ill,so he didn't go to work. (改错) He didn't go to school,（because he was ill).对括号内提问 he didn't go to school ,because he was b__ ill