______dull he may be, he is certainly a very successful top executive.A、Although

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问题 ______dull he may be, he is certainly a very successful top executive.

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

答案 D

解析此题关键在修饰形容词dull的只可能是副词，因此只有however符合题意。C表示由as引导让步状语从句，但as的位置不对；A、B的语法结构均不对。因此D正确。

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