选occur还是come about？

This sound doesn't ______ in Chinese,so it's difficult for the students to pronounce.
A、happen
B、occur
C、come about
D、take place

答案是B，我觉得应该是C呀

为什么不是come about 表示“发生、产生”，多指事情已经发生了，但还不知道为什么，常用于疑问句和否定句

而是 occur “发生、想到、突然想起” ？

为什么选这个？
按这种说法，come about不是更合适吗？

选occur还是come about？ occur 是vt. 还是vi.? happen,take place,occur,come about有何区别 come up还是turn up？ 得第四是come fourth还是come in fourth 到底是I come back还是i am come back? occur的用法 a disk error occur that he come home is crying 对还是he come home and is crying 还是 he come home crying对 come come!!!!!!!