Question

After three days' thinking, a good idea ________ to my mind. At last, we solved the problem.

1. A.
   happened
2. B.
   broke out
3. C.
   occurred
4. D.
   took place

Answer 1

C
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为正确答案。