问题
选择题
It is_______ that I can still remember_______ was discussed at the meeting.
A．sure; when
B．sure; what
C．certain; when
D．certain; what
答案
答案：D
题目分析：句意：我肯定记得大会上讨论过的事。sure的主语必须是人，排除AB，certain的主语可以是人和物，第二空用what，引导宾语从句，因为从句缺主语所以用what，答案D。