It is that I can still remember was discussed at the meeting. A. sure; whenB. sure; whatC.

问题补充：

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：

A. sure; when

B. sure; what

C. certain; when

(答案→)D. certain; what

解析：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。