Not until I completed the form did I realize that half the questions were not relevant to me.为什么不能说had I realized?

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Not until I completed the form did I realize that half the questions were not relevant to me.为什么不能说had I realized?

Not until I completed the form did I realize that half the questions were not relevant to me.为什么不能说had I realized?
Not until I completed the form did I realize that half the questions were not relevant to me.
为什么不能说had I realized?

Not until I completed the form did I realize that half the questions were not relevant to me.为什么不能说had I realized?
因为completed 在先,realized 在后.所以realize不可能用"过去完成时”

因为是过去式