Humble ------- it may be,there’s no place like home,-------

Humble as it may be,there is no place like home,wherever you may go.
as引导一个让步状语从句,意为：尽管,
整句直译为:
尽管卑微,但是不论你到哪里,都没有像家的感觉.
因为这里很明显用了倒装,只有as或者though有这个用法,although没有.
as / though引导的让步从句必须将表语或状语提前 （形容词,副词,分词,实义动词提前）.
注意：1) 句首名词不能带任何冠词.
2) 句首是实义动词,其他助动词放在主语后.如果实义动词有宾语和状语,随实义动词一起放在主语之前.
Try hard as he will,he never seems able to do the work satisfactorily.
注意:让步状语从句中,有though,although时,后面的主句不能有but,但是 though 和yet可连用.
所以先 B.