After three days' thinking, a good idea ________ to my mind. At last, we solved the problem.A.happenedB.broke outC.occurredD.took place
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C解析本题中四个选项都是不及物动词,happen和occur都意为“发生”,但occur还可以表示“想起,想到”;break out意为“ (战争、疾病等) 爆发”;take place相当于happen,也指可以预料的事情“发生”。本题句子的主语是a good idea,因此谓语动词只能使用occur,故C为正确