he__ the display for several minutes before re-entering his shopa) was gazing atb) gazed atc) had gazed atd) had been gazing at

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he__ the display for several minutes before re-entering his shopa) was gazing atb) gazed atc) had gazed atd) had been gazing at
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

he__ the display for several minutes before re-entering his shopa) was gazing atb) gazed atc) had gazed atd) had been gazing at
c) had gazed at
分析:before 引导的从句,主句一定要用完成时.

b

选c
就表示过去的过去进行的动作。