what had you done by the time were three years old

题目

what had you done by the time were three years old

答案

by the time 到.时间为止.by the time you were three years old 到你三岁时为止.在这里可以理解为 by the time 引导时间状语从句,但你在从句里面把主语漏打了.What had you done 你已经做了什么?这个句子用了过去完...