此题答案不能是 D,而应是 A。
Until you told me, I had no idea of it.
句子意思:直到你告诉我,我才知道此事。
Until you told me I had no idea of it.
=I had no idea of it until you told me.
=I didn’t have any idea of it until you told me.
=Not until you told me did I have any idea of it.