【正确答案】 D

【答案解析】as和although均可连接让步状语从句，表示“尽管”。as引导的让步状语从句要求用倒装结构，此结构可提至句首的有名词、动词原形、副词、形容词等，注意可数名词单数形式提至句首时不用冠词。如：Child as he is，he knows a lot．(名词前置)／Dark as the night was，he stillfound his way to my home．(形容词前置)／Try as he would，he couldn't open the door．(动词前置)。although无此用法，如果用although的话，应该是Although he likes her very much。