-----------------,water changes into vapor. a When heated b To heat c Heat d Heating 选哪个 为什么
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-----------------,water changes into vapor. a When heated b To heat c Heat d Heating 选哪个 为什么
-----------------,water changes into vapor. a When heated b To heat c Heat d Heating 选哪个 为什么
-----------------,water changes into vapor. a When heated b To heat c Heat d Heating 选哪个 为什么
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.
选A
选a,因为水被加热,是被动态,考查的是非谓语动词。
选A,完整的是when it is heated,省略it is,这里的it指主句中得主语water,
状语从句的主语(得为代词)和主句的主语是同一个,且从句的谓语用的是系动词,可省略从句的主谓
看明白没有