It is ________ that I can still remember ______ was discussed at the meeting.
A．sure; whenB．sure; whatC．certain; whenD．certain; what
D
“我肯定記得大會(huì)上討論過的事�！眘ure的主語必須是人，certain的主語可以是人和物，第二空從句缺主語所以用what，答案D。
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