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It is_______ that I can still remember_______ was discussed at the meeting.
A．sure; whenB．sure; whatC．certain; whenD．certain; what
D

試題分析：句意：我肯定記得大會上討論過的事。sure的主語必須是人，排除AB，certain的主語可以是人和物，第二空用what，引導賓語從句，因為從句缺主語所以用what，答案D。
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