问题描述：
请问一个英语句子的句子成份
After driving twenty miles,he suddenly realized that he had been driving in a wrong direction.这句中,逗号前边的不是一个分句,而是一个短语,driving是动名词,是这样的吗
After driving twenty miles,he suddenly realized that he had been driving in a wrong direction.这句中,逗号前边的不是一个分句,而是一个短语,driving是动名词,是这样的吗
问题解答：
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