这题目源自Dr. Lin Lougheed的(BARRON'S) 600 .... TOEIC一书(我手头的是第三版)。答案是B competing
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解答用Google Books(专找出版物)搜寻"competed products",原则上是没有(有出现个位数笔数。点开来看的话其实是OCRtypo)"competing products"本身是惯用表达
http://www.ldoceonline.com/dictionary/competing