30. Because of the heavy snow, a serious accident to the family.
A. occurred
B. happened
C. was happened
D. took place
网友回答
A. occurred
(答案→)B. happened
C. was happened
D. took place
解析：考查：发生happen，occur，指偶然发生，没有被动语态，take place 指按计划发生，在这里考查短语happen to碰巧发生，句意：由于大雪，一起严重的事故碰巧发生在这一家。所以选B。