题目

The accident ____if the taxi driver had been more careful.    A. could have been prevented    B. must have been prevented  C. could be prevented           D. can have been prevented 答案：A 20世纪二三十年代有过一场空前严重的世界性经济危机。假如你是当时美国一名普通市民，你会经历什么呢 A．股市崩溃，一夜破产 B．公司破产，下岗失业 C．股市暴涨，身价翻倍 D．市场繁荣，投资赢利