you may have, you should gather your courage to face the challenge.
A. However serious a problem.
B. What a serious problem.
C. However a serious problem.
D. What serious a problem.
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(答案→)A. However serious a problem.
B. What a serious problem.
C. However a serious problem.
D. What serious a problem.
解析：让步状语跟感叹句的混合。句意：无论你有多么严重的问题，你都要鼓起勇气去面对挑战。However+adj+主+谓；whatever+n+主+谓语。首先明白这是个让步状语从句,what不可引导,故不选B。