come about(尤指未经计划地)发生、产生
Please tell me how the accidentcame about.
请告诉我事故是怎么发生的。
常用于How did it come about that······?意为：怎么发生的?
在非正式英语中还可简化为How come+从句
How did it come about that he knew where we were?
他是怎么知道我们在什么地方的呢？
How come you were late for class again？)
1. If the driver had not got drunk, the accident wouldn’t have ____________.
A. come into being B. come up C. come across D. come about
正确答案：D
【解析】句意：如果这个司机没有喝醉，事故就不会发生了。come about为固定搭配，意思是＂发生；造成＂，指意想不到的事情突然发生。come up＂走近，发芽，被提及＂；come into being＂形成，产生＂；come across＂（偶然）遇见，碰见＂。
【归纳拓展】
come about是不及物动词短语，其后不能接宾语，也没有被动语态，主语一般为物。常指情况不受人控制地突然发生。常用于句型：How did it come about that...?＂某事是怎么发生的？＂；It come about that...＂……发生了＂。
2.How did it come ______ that you made a lot of mistakes in your homework？A．aboutB．alongC．aroundD．by
正确答案：A
答案解析
[解析]本题是说你怎么会在作业中犯这么多的错误。A项come(about)发生，造成(多用于how疑问句中，也可用于陈述句，符合题意。其他三项中，come along进行，进展，(机会)出现，(用在祈使句中)赶快，快点；come around苏醒；顺访；come by sth．=get/obtain得到，都与题意不符。