单选题 51.  He thought about the problem over and over, and suddenly a good idea ______ to him.
【正确答案】 B
【答案解析】[考点] 词语搭配
occur to sb. 意为“(主意或想法突然)浮现于脑中,某人突然想起”,为固定搭配。故选B。
   他一遍又一遍地思考这个问题,突然他想到了一个好主意。