many books____（send）to school since then为什么不写have been sent,而写had been sent
人气：410 ℃ 时间：2019-11-23 10:49:18
解答
since then 表示的是在过去的过去 要用过去完成时since then 不是自从那时的意思么他没有说到现在还有书送到学校来所以是从那时起到过去的某个具体时间要用过去完成时
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