高一英语语法填空题,英语强的进来看看Amber has a beautiful yellow-brown colour.Although it feels as hard as stone,it easily melts when____(heat).

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高一英语语法填空题,英语强的进来看看Amber has a beautiful yellow-brown colour.Although it feels as hard as stone,it easily melts when____(heat).
高一英语语法填空题,英语强的进来看看
Amber has a beautiful yellow-brown colour.Although it feels as hard as stone,it easily melts when____(heat).

高一英语语法填空题,英语强的进来看看Amber has a beautiful yellow-brown colour.Although it feels as hard as stone,it easily melts when____(heat).
heated

heated

when being heated
=when it is being heated
加热和融化是同时的,用现在分词被动式
heated过去分词表示被动和完成,这里不是完成的意思。heater 加热器;加热工