【题目】To their delight, their newly-developed products were not _____ for the demand as soon as they went on the market.
A. qualified B. flexible C. available D. adequate
在线课程【答案】D
【解析】
试题分析：考查形容词词义辨析。 句意：让他们高兴的是他们新上市的产品供不应求。 A. qualified有资格的；B. flexible灵活的；C. available 可获得的；D. adequate 足够的。根据句意可知选D。