Amy was very sad because her pet dog _____yesterday请问应该填什么?died?可是had died为啥不行?

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Amy was very sad because her pet dog _____yesterday请问应该填什么?died?可是had died为啥不行?

因为她的狗昨天死了,用过去时就行,没必要用完成时,那样就变成
她的狗昨天已经死了,用在句子中不是很通顺

have died 现在完成时