《史记》记载：“诸吕作乱；日蚀、昼晦。吴楚七国叛逆，彗星观天狗过梁野。”对这段史料的正确评论是：（）①反映了汉代儒家的天象与人事关联的思想观念②是司马迁写《史记》的笔记，与时代观念没有关系③这些记载为今天的天文研究留下了宝贵的资料④古书上的天象记载荒诞不经，没有研究的价值

A、①②

B、①④

C、①③

D、②④

If the prediction for the earthquake ________ more accurate, we would have been more prepared and many more lives would have been saved.

A．had been

B．was

C．has been

D．were