2015年GCT英语精彩语法复习:时态12

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过去完成进行时
    过去完成进行时由had been加现在分词构成，表示过去某一时刻之前开始的动作或状态一直延续到过去某一时刻。例如：
    It had been raining cats and dogs for over a week and the downpour had caused landslides in many places. 倾盆大雨下了一周，在许多地区引发了山崩。
    At last they gor the telegram they had been expecting. 最后他们收到了他们一直盼望的电报。