______ dull he may be, he is certainly a very successful top executive.[2006]A、A

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问题 ______ dull he may be, he is certainly a very successful top executive.[2006]

选项 A、Although
B、Whatever
C、As
D、However

答案 D

解析 “however+形容词或副词”引导让步状语从句，故选项D正确。

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