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英语
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They___the train until it disappeared in the distance .为什么用watched而不是saw
人气：271 ℃ 时间：2020-05-21 01:55:55
解答
在until的肯定句中,主句必须使用延续性动词,因为这个动作一直在继续.而see 是瞬间动词
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