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    精英家教网 > 高中英语 > 题目详情
    —— Do you still remember the day when we went to the Great Wall?
    —— I can’t remember it well, but＿＿＿＿＿＿sometime last autumn?
    A．might it beB．could it have beenC．could it beD．must it have been
    B
    could have done表示对过去发生情况的可能性推测。
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