【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(yǔ)從句。句意：無(wú)論問(wèn)題有多么棘手，他都會(huì)竭盡全力去解決它。疑問(wèn)詞+ever既可以引導(dǎo)名詞性從句，也可以引導(dǎo)讓步狀語(yǔ)從句，引導(dǎo)讓步狀語(yǔ)從句時(shí)相當(dāng)于no matter+疑問(wèn)詞。difficult是形容詞，修飾形容詞或副詞應(yīng)該用how或however，排除C；B項(xiàng)后缺少how，排除B；although后跟句子，排除D，故選A。

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