---What on earth are the police busy with?---They have been looking into how the plane crash _______.A.came outB.came upC.came downD.came about
网友回答
D解析词义辨析。came out出现,出版,结果是came up；提出来(流行,走近,来临,上,升)；came down下来，下落； came about发生。他们一直在调查坠机事件是怎么发生的？选D。