the global economy is showing signs of recovery, many developing countries are still suffering.
A. As
B. Where
C. How
D. While
网友回答
A. As
B. Where
C. How
(答案→)D. While
解析：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。