The Japanese car, which is more economical, has long been consid

The Japanese car, which is more economical, has long been considered a _________ to US car makers.
A、competing
B、competitive
C、competition
D、competitor
【正确答案】：D
【题目解析】：a后面接名词，排除A、B项，C项：竞赛，竞争；D项：竞争者，由题意可知，日本车对于美国车来说，是一个竞争者，所以选D项。