问题描述:
when 引导的时间状语从句主句选择过去完成时还是过去式怎么样选择,我也知道主句如果发生在从句之前用过完
那么这句话怎么解释呢?my father has been a shop assistant for over twenty years.he began to work as a shop assistant when he was fifteen years old.真愁人怎么就不理解呢?请高人指教.
那么这句话怎么解释呢?my father has been a shop assistant for over twenty years.he began to work as a shop assistant when he was fifteen years old.真愁人怎么就不理解呢?请高人指教.
问题解答:
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