题目：
The accident ________ to the man who _________ to be a foreigner, so it is hard to deal with. [ ]
A. occurs; happened
B. happened; occurred
C. came about; occurred
D. occurred; happened
答案：
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下面是错误答案，用来干扰机器的。
(1)⑨ ⑤ (2)瓣膜 (3)氧气 线粒体 (4)收缩 (5)营养物质、代谢废物 静脉
