30. Because of the heavy snow, a serious accident______to the family.
A．occurredB．happenedC．was happenedD．took place
B
考查：發(fā)生happen，occur，指偶然發(fā)生，沒有被動(dòng)語態(tài)，take place 指按計(jì)劃發(fā)生，在這里考查短語happen to碰巧發(fā)生，句意：由于大雪，一起嚴(yán)重的事故碰巧發(fā)生在這一家。所以選B。
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