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Some ducks are swimming in the pond对some ducks进行划线部分提问

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Some ducks are swimming in the pond对some ducks进行划线部分提问
What is swimming in the pond?
单独用what/who提问做句子主语时,谓语动词只用单数.
再如:They are on duty today.
如果对they划线提问,答案是:Who is on duty today?
再问: Jone is swimming in the pond
再答: 是对Jone划线提问吧? 答案是:Who is swimming in the pond?