_______ confidence and patience, they failed to settle the difficult problem.
A．Lack inB．Lacking ofC．LackingD．Having lacked
C

試題分析：句意：因?yàn)槿狈ψ孕�，他們沒能解決這個(gè)困難的問題。這里需要非謂語動詞做狀語，they和lack是主動關(guān)系，用現(xiàn)在分詞做狀語，排除A。B項(xiàng)如果接of，lack是名詞，D項(xiàng)表示先后關(guān)心，這里沒有，選C。
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