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-----------------,water changes into vapor. a When heated b To heat c Heat d Heating 选哪个 为什么
人气:203 ℃ 时间:2020-05-09 09:02:25
解答
选 a 相当于:when (water is省略了括号里的主谓部分) heated,water changes into vapor.“水”和“加热”之间是动宾关系,所以用过去式,表被动.
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