请教一道英语语法题He is wondering___how much energy it takes(要花多少

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请教一道英语语法题
He is wondering_____how much energy it takes__(要花多少能量)to raise the temperature of oil by1℃.(take)
请问划横线处作的什么成分?这是个高考题,我想问的是,这到底考查的是什么知识点呢?He is wondering这是作什么成分呢?

句子主干：He is wondering how much...it takes...
这是一个复合句,句子套句子.不知能看出来否?
主句的主谓是He is wondering,如果不加时态来看,则就是He wonders.
Wonder是想知道的意思.
从句是一个宾语从句,因为这个句子的位置是放在了主句的宾语位置上.而宾语从句的主谓一定是陈述句语序.It takes how much energy to raise...这个是宾语从句还原成最初的状态,但是how much energy要提前,所以就成了how much energy it takes to raise...
这里面的句型是It takes/took sth to do sth. 不定式是真正的主语,it是形式主语.
高考题里面我觉得语法最难的部分在于冠词.多看看吧.而名词性从句虽说是重中之重,但是掌握了原理就简单了.

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