这是as(though)的倒装用法
名词/副词/形容词/动词+as(though)+主语+谓语
副词置于句首.如：
Much as I like it (＝Although I like it very much),I will not buy it.
动词原形置于句首.如Wait as you may(＝Although you may wait),he will not see you．
形容词或名词置于句首.注意：如果表语是名词,则要省掉冠词,如：
Proud as the nobles are (＝Although the nobles are proud),they are afraid to see me．
Child as he is (＝Although he is a child),he can tell right from wrong．
希望你有所收获!