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    精英家教网 > 高中英语 > 题目详情
    19．I don't know if you noticed their absence or not，but I _____________．（　　）
    A．doB．haveC．hadD．did

    分析 我不知道你是否注意到了他们的缺席，但我注意到了．

    解答 答案是D
    根据句意，空格中要填的词指代 noticed their absence or not，根据时态一致用do的过去式I did指代I noticed their absence or not．

    点评 本题考查过去时，做这个题时要先确定所需要填的部分指代的内容，然后根据句意确定单词和时态．

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