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    15．If Nina _____ that her husband would go to the bus stop to meet her，she wouldn't have walked back home．（　　）
    A．knowsB．knewC．has knownD．had known

    分析 如果Nina早知道她的丈夫会去汽车站接她，她就不会走着回家了．

    解答 答案：D 
    分析句意可知，本题考查的是虚拟条件句，当条件句表示与过去相反的事实时，要用过去完成时即：had+done的形式，主句谓语用"should （would，could，might）+have+done；根据主句的意思：她就不会走着回家了．可知，之前她不知道她的丈夫会去汽车站接她，此处从句表达了与过去相反的事实，所以要用虚拟语气即：had+done的形式．故选D．

    点评 本题考查的是虚拟条件句．需要注意牢记以下用法：（1）表示与现在事实相反，条件从句的谓语用过去式（be通常用were），主句谓语用"should （would，could，might）+动词原形"；（2）与过去事实相反，条件从句的谓语用过去完成时（had+过去分词），主句谓语用"should （would，could，might）+have+done"；（3）与将来事实相反，条件从句的谓语用过去式（be通常用were），主句谓语用"should （would，could，might）+动词原形"．

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