CODA THIRTY YEARS AFTER怎么样

CODA THIRTY YEARS AFTER怎么样 AFTER MANY YEARS怎么样 （英语单选）After about thirty years of no Thirty years had passed----- he kenw it A.after B.when C.bef another thirty years= thirty years on 是什么意思? 为什么是thirty years ago 而不是thirty years before? uncle is thirty years old. His grandfather ___for thirty years. My uncle is thirty years old. Thirty years or so ago什么意思? 英语翻译he must be--------- ------------thirty years old