they arrived at the river soon 是both 还是all?两个人

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they arrived at the river soon 是both 还是all?两个人
they arrived at the river soon 是both 还是all?两个人

they arrived at the river soon 是both 还是all?两个人
两个人是both 三人及以上可以用all

两个人是both

Both all 指两个以上