you may have, you should gather your courage to face the challenge.
A. Whatever serious a problem
B. However serious a problem
C. However a serious problem
D. No matter how a serious problem
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A. Whatever serious a problem
(答案→)B. However serious a problem
C. However a serious problem
D. No matter how a serious problem
解析:考查让步状语从句:句意:无论你可能遇到多么严重的问题,你都要鼓足勇气面对挑战。Whatever后面接名词,排除A。however/no matter how后面可以接adj+冠词+名词,CD都是错的,选B。