【题目】Most countries of the world have records of the great natural catastrophes that before.
A. had occurred B. have occurred
C. occurs D. would occur
在线课程【答案】B
【解析】
试题分析：“have occurred”表示已经发生，主句是一般现在时，从句发生在主句动作之前，且有before,故用现在完成时。句意：世界上大多数国家都有已经发生的重大自然灾害的记载。故选B。