You can't go out ( ) your homework is being done答案是until,before为什么不行,

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• 用所给词的适当形式填空.有两个地方不懂.（1）If your homework ＿（do）,you can go out to play.（1）If your homework ＿（do）,you can go out to play. （2） My mother has some clothes＿（wash）every morning.我看了答案,第（1）题是is done .请问为什么不是has done.表示已经完成.have +过去分词不是表示已经完成了吗,is done和has done区别在哪,be动词+过去分词好像是被动语态的结构,那么岂不是翻译成”被完成“,还有第（2）题是to wash,请问为什么用不定式to,是有什么固定结构么?麻烦各位替小生解答,不甚感激!
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• until 和before的区别you can't go out ____ your work is being done是填until还是before 为什么
• ------------------------------ ---------------------------- 1 、-- Mum,can I go out and play now?-- Not ______ you have done your homework.A 、until B 、after C 、when D 、because 2 、As soon as the music stopped,every one _______.A 、freeze B 、froze C 、frozen D 、freezes 3 、-- David works ____ at school?I can ____ believe this.He used to be a lazy boy.-- People change.A 、hard; hardly B 、hardly; hard.C 、hardly; hardly D 、hard; hard 4 、-- Can’t you see?The riv
• 一道关于unless until区别的单选题下面这题-May I go out to play now,Mom?-No,you can’t go out ____ your homework is being done.A.until B.unless但是我清楚为什么不能选A.但是我不清楚为什么不能选A。之前我的提问中少打了个“不”字。不过还好大家都理解我说什么了。现在补上。
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