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He tried his best to solve the problem, _______ difficult it was.
A．whateverB．howeverC．whicheverD．wherever
B

試題分析：No matter +特殊疑問詞引導讓步狀語從句，意為：無論…；意為后面接形容詞difficult，所以使用how.而不是what. 句意：無論問題有多難，他都全力以赴地解決它。故B正確。
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