請教一個(gè)英語問題

答案是第2個(gè)as。
Complicated as it is

這是一個(gè)as引導(dǎo)的讓步狀語從句,as的意思是盡管?？蓳Q成though,但不能用although

答案選 B，as。as引起讓步狀語從句時(shí)，意思是＂雖然＂，句子需要倒裝。倒裝的做法通常有四種：1，名詞做表語提前，如：Child as he was, he could speak two languages. 2, 形容詞作表語提前，如：Sad as he was, she smiled to them_
3, 部分謂語動(dòng)詞提前，如：Try as you might, you could not succeed.
4, 副詞提前，如：Hard as you work, you can't support your family.
你的這個(gè)題目屬于第二種，形容詞作表語提前。

B
adj+as it is，倒裝強(qiáng)調(diào)句。“盡管它xxx，”