you may have , you should gather your courage to face the challenge .
A．However serious a problem
B．Whatever serious a problem
C．However a serious problem
D．No matter how a serious
A

試題分析：考查讓步狀語從句。因為后面直接接了形容詞serious，說明前面使用how；因為what后面接名詞或者名詞短語。句意：無論你遇見如何嚴重的問題，你都應(yīng)該鼓起勇氣面對挑戰(zhàn)。故A正確。
點評：however后面接形容詞或者副詞；whatever后面接名詞或者名詞短語；這些都可以用來引導(dǎo)讓不狀語從句。
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