He tried his best to solve the problem, _____ difficult it was.
A．howeverB．no matterC．whateverD．a(chǎn)lthough
A
考查讓步狀語從句。因?yàn)閐ifficult是形容詞，所以用how對(duì)它進(jìn)行強(qiáng)調(diào)。B選項(xiàng)應(yīng)該加how;句意：無論有多么困難，他總是努力解決這個(gè)問題。
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