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They were walking home _____ a tall man stopped them and dem

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They were walking home _____ a tall man stopped them and demanded their purses.A.when B.while C.that D.until 为什么?还有,为什么不能选D?
我觉得选until可以突出“他们走路回家”这个动作一直持续到那男的拦住他们…为什么不可以这样理解呢?
They were walking home _____ a tall man stopped them and dem
这是when的一个句型,when表示“突然”,when前面的句子共有三种情况
1.进行时 (本题)
2.be about to 即将,正要做某事 I was about to go out when the telephone rang.
3.状态 (比如be at work)