When________toahighenoughtemperaturewatercanchangeintovapour.A.heatingB.beingheatedC.heatedD.havingheated

问题：When________toahighenoughtemperaturewatercanchangeintovapour.A.heatingB.beingheatedC.heatedD.havingheated

答案：↓↓↓

景秀并的回答：

网友采纳　　答案C　　题意“当被加热到一个足够高的温度时,水会变成气体.”这是一个省略了的状语从句,原句应是Whenwaterisheatedtoahightemperature,when引导的状语从句可省略主语和系动词be."