---you have agreed to go with me.so why aren't you getting ready?----but i ____that you wanted me to start at once.为什么填didn't realize?我觉得是hadn't realize

---you have agreed to go with me.so why aren't you getting ready?----but i ____that you wanted me to start at once.为什么填didn't realize?我觉得是hadn't realize
---you have agreed to go with me.so why aren't you getting ready?
----but i ____that you wanted me to start at once.
为什么填didn't realize?我觉得是hadn't realize

---you have agreed to go with me.so why aren't you getting ready?----but i ____that you wanted me to start at once.为什么填didn't realize?我觉得是hadn't realize
本句时态的起点是现在时so why aren't you getting ready,所以不用过去完成时；
空格里理解为“我刚才（原来）没有意识到...”
翻译：甲：你已经同意和我一起去了,那么你现在为什么不在做准备呢?
乙：可以我刚才没有意识到你要我立刻动身呀!

呵呵，没认识到是指说这句话之前，所以用过去时态。

---You have agreed to go with me.so why aren't you getting ready?
----But I didn't realize that you wanted me to start at once.
你已经同意和我走了，为什么还不准备好？
但是我没意识到你要我马上就着手准备啊~！
解析： realize...

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---You have agreed to go with me.so why aren't you getting ready?
----But I didn't realize that you wanted me to start at once.
你已经同意和我走了，为什么还不准备好？
但是我没意识到你要我马上就着手准备啊~！
解析： realize 的动作是发生在说话人说话之前，且只是描述一个事实，用过去时态，并不强调动作造成的影响结果。此外，过去完成时态是 had done 的结构，即 had realized，是发生在过去的过去，不符合语境。
望采纳，祝开心~！！！

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这个和动词的词义有关系的，didn't realize 就是指当时没认识到，而你所说的hadn't realize是没有已经认识到。结合到句子里面，是不是前面的表达更好呢?

didn't 就是单纯的没有，完整的说就是我没有想到。而hadn't更像是一个时间段的，他只是一个普通的过去式，hadn't就变成过去完成时了