He wants to be a great () star like Liu Xiang.用run的正确形式填空.

问题描述:

He wants to be a great () star like Liu Xiang.用run的正确形式填空.
为什么不是runer,而是running?拜托讲仔细,

runer,He wants to be a great (runer) like liu xiang,runer 已经是名词了
running现在分词做形容词,