问题详情：
With rising work pressure in big cities, Zhang Yixuan decided to return to his hometown. Before that, he _________ at a media company since his university graduation.
A．had been working B．had worked C．worked D．has worked
【回答】
A
【解析】
A考查时态。句意：随着大城市的工作压力不断增加，Zhang Yixuan决定回到他的家乡。在那之前，他从大学毕业就一直在一家媒体公司工作。由时间状语since his university graduation可知用完成时态；根据句意他一直在一家媒体公司工作，可知是动作正在进行，故用完成进行时态，故选A。
知识点：过去完成进行时
题型：选择题
