It_________five or ten years before the new medicine is test

It_________five or ten years before the new medicine is test The Kings had lived in New York for ten years before they ca ____a manager ten years before. （ ）,the new medicine is now in mass production. 29.Before the medicine, ought to study the instructions or f 英语翻译AND TEST THAT THE POWER IS OFF BEFORE WIRING. ten years before 和ten years ago 有什么区别? ten years before和ten years ago的区别? ago是不是等于before?比如ten years ago是不是等于ten years before等于before 英语划线句子提问We had had the toys for ten years before we gave the It is ten years 是before还是since还是until he come back 英语短文改错,My father,who worked on a farm ten years before ,is n