Please tell me how global warming . I am still in the dark.A. came byB. came outC. came to

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A. came by
B. came out
C. came to
(答案→)D. came about
解析：动词短语辨析。A经过；B出版，发行；C涉及到，谈及；D产生，发生；句意：请告诉我全球变暖是如何产生的，我仍然不清楚。根据句意说明D正确。