题目内容

2．By the end of last week，she______in the west of China for two months helping the homeless children．（　　）
A．will stayB．has stayedC．would stayD．had stayed

分析 到上周末，她已经在中国的西部待了两个月，帮助那些无家可归的孩子．

解答 答案：D 过去完成时的构成：had+过去分词，表示在过去的某时刻或者某个动作以前就已经发生或完成的动作．根据“By the end of last week”上周末就是过去的时间状语，By the end of意为“在…结束之前”，可知stay是在过去的时间之前发生的动作，所以就要用过去完成时．故选D．

点评 过去完成时的一个重点就是“过去的过去”，首先要找出这个“过去”的参照物来，然后就可以确定使用过去完成时了．

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