廊曼国际机场有地铁吗:Any body, when ( ) to a high temperature, becomes a source of light.

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Any body, when ( ) to a high temperature, becomes a source of light.
1.to be heated 2.heated 3.being heated 4.having heated
原因写详细点(有什么语法或词组之类的),劳驾各位了。我还有很多问题没人答,麻烦高手也去看看,谢谢拉。

在时间状语从句,条件状语从句,方式状语从句,比较状语从句里,由于从句主语和主句主语相同,所以从句里的主语,通常是it is常被省略,你选择的时候只需在从句里把it is 补上,后面动词是用什么形式,不就会填了么
when it is heated
所以填heated

heated

Any body, when ( ) to a high temperature, becomes a source of light.
1.to be heated 2.heated 3.being heated 4.having heated

3.being heated
body被heat是被动语态,但有when,不能说when heated,只能being heated