when someone ___ahead of you opens the door for you.A walks B wal_英语解答

when someone ___ahead of you opens the door for you.A walks B walking C is walking 选哪个为什么谢

人气：401 ℃　时间：2020-05-02 05:02:42

解答

B
分词形式做定有修饰someone,表示主动状态“走在你前面的某个人”