my father ---old.he---twenty years ago.(be)
问题描述：
my father ---old.he---twenty years ago.(be)
答
My father was in the army two years ago My father 主语 was 充当谓语我爸爸退伍已经2年了，这本书对你大有益处！ 1.介词不能单独作句子的
答
is , was
答
你的后面一句好像落了一个old