问题补充：
He spent twice as much time on this picture as on that one.老师说这里有个比较状语从句.我死都看不出怎么从句了
答案：
这个确实是比较状语从句, 话说我如果这样写你就能看出来了
He spent twice as much time on this picture as (I spent ) on that one.
因为有省略的缘故, 所以不是很容易看出来, 牢记as..as...的这种用法即可
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