因为后面的时间状语时last month
句意：上个月我和父母呆了三天.
had been 是个过去完成,动作发生在过去的过去
它的使用要有过去的时间点,或者过去的动作作为参照
I ______there for three days with my parents last month 答案是was 为什么不能用过去完成时had been
I ______there for three days with my parents last month 答案是was 为什么不能用过去完成时had been
英语人气：982 ℃时间：2019-08-20 22:14:32
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