Question

翻譯下列句子。

1. 去年老李退休了。退休前他教了30年數(shù)學(xué)。
   Last year Lao Li _____. Before that he _____ for thirty years.
2. 到上個(gè)月底，我們已完成了工作的50%。
   _____ last month, we _____ 50% of our work.
3. 在他搬到北京之前，他就已經(jīng)和我們是好朋友了。
   _____ he moved to Beijing, he _____ a good friend of ours.

Answer 1

1. retired, had taught
2. By the end of, had finished
3. Before, had been