-John.you go out to play until your homework ．-OK.Mum．( )A．must, finishesB．can't, is finishedC．can't, has finishedD．needn't, finishes 题目和参考答案——青夏教育精英家教网—

18．-John，you go out to play until your homework ．
-OK，Mum．（　　）

	A．	must； finishes		B．	can't； is finished
	C．	can't； has finished		D．	needn't； finishes

分析 --约翰，直到你的作业做完了，你才能出去玩．
--好的，妈妈．

解答答案：B not…until…意为"直到…才"，not用在主句中，until引导后面的从句．根据作业是被做完的，要用被动语态，故选B．

点评有些结构是分开用的，并不是连在一起使用的，这时候就要注意发现这些搭配，要不就很容易造成误选错选．

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