【題目】He tried his best to solve the problem, ____ difficult it was.

A. however B. no matter

C. whatever D. although

【答案】A

【解析】試題分析：考查讓步狀語從句。句意：無論問題有多么棘手，他都會竭盡全力去解決它。疑問詞+ever既可以引導名詞性從句，也可以引導讓步狀語從句，引導讓步狀語從句時相當于no matter+疑問詞。difficult是形容詞，修飾形容詞或副詞應該用how或however，排除C；B項后缺少how，排除B；although后跟句子，排除D，故選A。

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