________ the global economy is showing signs of recovery, many developing countries are still sufferingA.AsB.WhereC.HowD.While
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D解析试题分析：句意：虽然全球的经济有复苏的迹象，许多发展中国家仍然处于困境。表示“虽然”且置于句首的词有：while, although, though。as有“虽然”的意思，但必须用于倒装句。如：child as he is , he knows a lot. 倒装句中除了as，还可以用though。考点：考查连词while表示“虽然”。