as在英语用法中是个多面手，既可以当副词使用，也可以当介词使用，还可以引导状语从句。但是你们知道as还可以用于倒装句嘛？
请看例题：___ ，I have never seen anyone who's as capable as John
A. As long as I have traveled
B. Now that I have traveled much
C. Much as I have traveled
D. As I have traveled so much
此题，如果单考虑翻译，CD句意通顺，D更合乎我们正常语序，很多人都会选D，然而D错.这是因为，as表"尽管..."引导让步状语从句置于句首必须要倒装，(不倒装反而语序错误)那么为什么要选C，这道题as引导让步状语从句又是怎么倒装呢？请看解析 ：as不倒装的形式应为→As I have traveled much相当于
as➕主语(I)➕谓语动词(have traveled)➕副词(much)
as让步状从至于句首只能倒装，则应改为→
副词➕as➕主语➕谓语动词.既： Much as I have traveled,毫无疑问，答案一定是C
