问题描述：
英语高手请分析一句语法
Before he joined the group,he had played guitar
after they had recoreded Let It Be,the band split up.
为什么before后接的是过去式,后面用完成时
而after刚好相反呢?
Before he joined the group,he had played guitar
after they had recoreded Let It Be,the band split up.
为什么before后接的是过去式,后面用完成时
而after刚好相反呢?
问题解答：
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