英语翻译
问题描述：
英语翻译
He began to work___ ___ ___ ___ ___.
He began to work___ ___ ___ ___.
He began to work___ ___ ___.
对应填空.一空一词.
He began to work___ ___ ___ ___ ___ ___。加了一格
答
1,at the age of 12
2.when he was 12
3.at his twelfth
4.at the twelfth of his life