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    20．The Chinese people are kind and caring．If not，I _____ in China in the past 30years．（　　）
    A．didn't stayB．hadn't stayed
    C．couldn't stayD．couldn't have stayed

    分析 中国人民善良有爱心．如果不是这样，在过去的30年我不可能呆在中国．

    解答 答案是D．本题考查虚拟语气；题干中If not完整的表达是"If the Chinese people were not kind and caring"，是与现在事实相反的虚拟条件，主句中的"in the past 30 years"说明的是与过去事实相反的结果；与过去事实相反的结果主句中动词用"would/should/could/might+have done"，故选D．

    点评 在掌握虚拟语气的规则的基础上，判断题干属于什么类型的虚拟，然后根据语境，选用恰当的动词形式表达虚拟．

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