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”
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
英语人气：246 ℃时间：2020-05-02 05:02:42
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