问题描述：
新概念英语第三册选择题
He ____the display for several minutes before re-entering his shop .
A,was gazing at B.gazed at C,had gazed at D,had been gazing at
请告知理由,
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
请告知理由,
问题解答：
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