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--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
考查短语辨析。come out 开花,出版,come up 走近,上来,被提出,come down 降低,下来,come about 产生,发生.答语的意思为:他们在一直调查飞机坠毁是怎么发生的。所以答案选D 。
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