I"d say she was the most creative act!省略的I"d 是什么词？

I'd = I would (见http://dict.cn/I'd.htm）
见朗文英英词典would的第二个词条：
2 imagined situations
a) used when talking about a possible situation that you imagine or want to happen:
What would you do if you won a million pounds?
I'd be amazed if I got the job.
I wish they'd come and visit us.
If only he would listen to

I HAD 并省略了THAT

不是I would么?还是I did？……
我英语不好－－！

I would
had say 说不通,不是它.