问题标题：
therearetwo()inthecityAcar'factoryBcar'sfactoriesCfactoriesofcar'sDcarfactories
问题描述：
therearetwo()inthecity
Acar'factoryBcar'sfactoriesCfactoriesofcar'sDcarfactories
韩延彬回答：
Dcarfactory是固定词组,复数变化在factory上面
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