In autumn, leaves turn yellow and the trees.A. fall out B. fall off C. fall down D. fall

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A. fall out
(答案→)B. fall off
C. fall down
D. fall over
解析：考查短语辨析。fall out退出，fall off从什么掉下，fall down摔倒，fall over
急于做某事，句意：在秋天，树叶变黄从树上掉下来。故选B。