她到底是谁 用英语怎么说

我是英语老师，帮帮你。
on earth 到底，究竟（用于疑问代词或副词后表强调）
例：What on earth are you doing now?
你到底在干什么？
她到底是谁？Who on earth is she?
祝你进步！

who the heck(the hell) is she?

Who is she on earth?on earth应置于句末。

Who is it on earth?最标准的美式口语。

who is she on earth?

Why did she not on Mars