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

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

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

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