题目内容

---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
D
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。
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