过去完成时和过去完成进行时He ...the display for several minutes before re-entering his shop.(c)had gazed at (d) had been gazing at为什么选c,而不是d?
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题目内容：
过去完成时和过去完成进行时
He ...the display for several minutes before re-entering his shop.(c)had gazed at (d) had been gazing at
为什么选c,而不是d?
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