who is talking?who are talking?哪个对Tom,Mary and Peter are talking happily.主语划线提问，难道不是who are talking?
网友回答
who is talking 对 who可以看成是第三人称单数
你提问之前肯定不知道你问的“谁”是单数还是复数,难道一句话用单数还是复数还要根据回答来确定吗,这是不可能的.
who就是第三人称单数,所以用is
======以下答案可供参考======
供参考答案1:
who is talking ? 对的
供参考答案2:
who is talking？对
供参考答案3:
Who are talking happily?