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<http://wenku.baidu.com/new?act=update&id=63eb0fabd5bbfd0a79567393&fr=view> 51. __dull he may be, he is certainly a very successful top executive.
A Although B whatever C As D However 正确答案为D). however引导的让步状语从句意思是无论怎么样)从句需要倒装,即However+adj/adv+主+谓. However dull he may be=Dull as he may be. although和as引导让步状语从句尽管whateve用来引导名词从句意思是无论什么句意无论他多么地人感到乏味他还是一位非常成功的顶级行政人员.
