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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
    “我肯定记得大会上讨论过的事。”sure的主语必须是人，certain的主语可以是人和物，第二空从句缺主语所以用what，答案D。
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