he__ the display for several minutes before re-entering his shop

分类: 作业答案 • 2022-01-09 18:05:09

问题描述：

he__ the display for several minutes before re-entering his shop
a) was gazing at
b) gazed at
c) had gazed at
d) had been gazing at

答

c) had gazed at
分析：before 引导的从句,主句一定要用完成时.