28、 You may not go out _________your work is done A、beforeB、untilC、whereD、as

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• You may not go out until your work is done.
• 28、 You may not go out _________your work is done
• You may not go out until your work is done.这句话若要改成before连接句子怎么改?You may not go out___your work is done.A.before B.until C.where D.as请问下面的Before your work is done,you may not (can not)go out.这里的before从句必须放前面吗？如果可以放后面,那这道题的答案不就是A,B了？有没权威点的语法解释啊。找到一个比较权威的语法解释:希望对以后有同样问题的人有用:不少的语法书上说，before引导的从句习惯上不与否定的主句连用，要用until。实际上二者都可以，有时在意义上有些区别。试比较：He didn't arrive until I returned.直到我回来时他才到达。He did not arrive before I returned.在我回来之前他尚未到达。I didn't manage to do it
• 28、 You may not go out _________your work is done A、beforeB、untilC、whereD、as
• with so much work to be done ,Tom has to stay at home 其中,to be done 对吗,可以用done,或to do?要求：区别一下to do与分词的区别,
• you can hardly imagine what grate difficulty we had ding the work为什么用what 代指哪两方面,一个是imagine 后的宾语 另一个呢?、