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选择题:He__the display for several minutes before re-entering h

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选择题:He__the display for several minutes before re-entering his shop.
(A)was gazing at
(B)gazed at
(C)had gazed at
(D)had being gazing at
答案是B,我觉得是C.请高手分析一下.
参照新概念英语第三册第六课选择题5.
此处before表示“过了多久之后才……”,意思是“他看了摆出的商品几分钟之后才再次进入商店”,所以选B