c) had gazed at
分析：before 引导的从句,主句一定要用完成时.
he__ the display for several minutes before re-entering his shop
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
a) was gazing at
b) gazed at
c) had gazed at
d) had been gazing at
英语人气：204 ℃时间：2020-05-09 02:46:49
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