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
人气：431 ℃ 时间：2020-05-09 02:46:49
解答
c) had gazed at
分析：before 引导的从句,主句一定要用完成时.
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