she told me her name only after i had asked her twice

问题描述:

she told me her name only after i had asked her twice
he told me her name only after i had asked her twice这句中为什么用had asked 而不用ask?

主语用了过去时,
而“i ask her twice”发生在主句动作发生之前,过去的过去,所以用过去完成时.