I still remember the day when I said goodbye to myfamily,______on the plane and started my journey to London.答案是stepped,为什么不填stepping,现在分词作伴随状语?

问题描述:

I still remember the day when I said goodbye to my
family,______on the plane and started my journey to London.答案是stepped,为什么不填stepping,现在分词作伴随状语?