_______ they may have, the CEO of the corporation calls on all the staff to gather their courage to strive it.A.What a serious problemB.However a serious problemC.How serious a problemD.Whatever a serious problem
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D解析分析句意，无论他们有多严重的问题，公司的首席执行官都能召集所有员工鼓起勇气解决问题。选项【A】【C】为感叹句结构，与句意不符。【B】选项中，连接词however应接形容词或副词，即however serious the problem may be。因此【D】项正确。