—Mother, I climbed up to that tall tree and picked this big apple—Jesus! You down and h

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(答案→)A. might have fallen
B. might fall
C. must have fallen
D. must fall
解析：句意：--妈妈，我爬上那颗高高的树摘了苹果。--Jeuus，你可能会掉下伤了自己。因为是对过去的推测，排除BD，Might have done是对过去的不确定的推测“可能会做”， must have done过去一定做了，不符合句意。选A。