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    精英家教网 > 高中英语 > 题目详情
    11．-I went to the Australia Embassy yesterday to apply for a visa．
    --Oh，you _____ that because you can apply on line．（　　）
    A．don't need to doB．mustn't do
    C．can't have doneD．needn't have done

    分析 -昨天我去澳大利亚大使馆申请签证了．
    -哦，你本来不必如此的，因为网上也可以办的．

    解答 答案：D．
    根据题干中的时间状语yesterday可知办签证这事发生在过去，再由结构"情态动词+have done"表"对过去情况的推测"，结合这两者可排除选项A和B．C选项can't have done表"过去肯定没有做某事"在此意为"昨天肯定没有去申请签证"，前后文自相矛盾，故也排除．D选项needn't have done表"本没有必要做某事却做了"．根据because从句可知，网上可以办理签证，所以"你昨天本来没有必要去大使馆办理的"，与上文相互照应，语意吻合，符合逻辑．故选D．

    点评 情态动词与过去完成式连用，表"对过去情况的推测"，其结构为"情态动词+have done"．如：can't have done表"过去肯定没有做某事"；could have done表"本来能做成的却没有做成"；must have done"过去肯定做了某事"；should/ought to have done表"本该做某事却没有做"；shouldn't/oughtn't to have done表"本不该做某事却做了"；needn't have done表"本没有必要做却做了"

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