It was a meeting ___ importance I did not realize at the time.为什么要填whose?请帮我翻译一下.

问题描述:

It was a meeting ___ importance I did not realize at the time.
为什么要填whose?请帮我翻译一下.

后句变正常语序的原句是
I didn`t realize its importance at the time.所以变成这个句式后,its跟importance的关系