Question

it is a meeting _importance i didn't realize at that time.a which b that cwhose

为什么呀谢啦

Answer 1

选择whose 这句话的意思是那时一个我当时还没有意识到它重要性的会议。
由句意可知，importance 与 meeting间有一定的从属关系，因为是会议的重要性，
表从属关系是 关系词用whose
例如 we lived the house whose roof is old,这句话就是说我们住在一个屋檐很旧的房子，屋檐是房子的，两者有从属关系 所以用whose。

Answer 2

选C。WHOSE=OF WHICH

Answer 3

C
~O(∩_∩)O