关于by the time的
1.By the time you arrive in London,we_will have stayed__in Europe for tow weeks.
2.By the time we got to the cinema,the film__had been on__for half an hour.
3.By the time she left school,she _had taught__that course for ten years.
,这三个句子 结构是不是差不多~我们老师讲的 前面是by the time 后面 有for 就用现在完成~为啥第二题 和第三题 就不是 用的是 过去完成~