1.I didn't go to bed until I _____ all my homework.

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1.I didn't go to bed until I _____ all my homework.
A.had finished B.finishes C.has finished D.am fishing
请写一下为什么,还有,请问一下start和begin的区别!

选择A,句子本身用的是过去式,在那睡觉之前应该是过去完成时,表示过去已经完成了的事情!
1) 谈及一项长期活动或开始一种习惯时,使用doing.How old were you when you first started playing the piano?你几岁时开始弹钢琴?2) begin,start用进行时时,后面动词用不定式to do I was beginning to get angry.我开始生起气来.3) 在 begin,start 后接know,understand,realize这类动词时,常用不定式to do.I begin to understand the truth.我开始明白真相.4) 物作主语时 It began to melt.(迟铁梅)（这是老师的经验,希望我们都能学习）

1.I didn't go to bed until I _____ all my homework. I didn't go to bed until I finished my homework 同义句 I went t I didn't go to bed until i finished my homework改为同义句 I didn’t go to bed until I finished ( ) my homework. i didn't go to bed until my homework()yesterday evening. 请问英语高手：I didn't go to bed until finishing my homework.这句话有没有 I won't go to bed until i finish my homework.(同义句) I will go 1.I didn't go to bed--[since,until]my mum came back last nig i didn"t go to bed until my father came back中until是什么词性 I to bed until I finished my homework(not go) I (go)to bed until I (finish)my homework I won‘t go to bed until I finish my homework.改为同义句