21.Many Chinese brands, ______ their reputations over centuries, are _______ new challenges from the modern market.
A. having developed, facing B. being developed, faced
C. developed, faced D. developing, facing
【答案】A
【解析】
【详解】考查现在分词和时态。句意：很多中国品牌历经几个世纪，树立了声誉，它们正面临着当代市场面临的新挑战。 their reputations over centuries在句中作状语，修饰整个句子。句子主语many Chinese brands与动词develop之间是主动关系，且句中有延续性的时间状语over centuries，第一个空应该用现在分词的完成式表示主动和延续性的动作；表示正在进行的动作，用现在进行时，故选A。
