During your English study, you will many difficulties.A. come aboutB. come outC. come byD.

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A. e about
B. e out
C. e by
(答案→)D. e across
解析：这题考查词组辨析：e about发生，e out出版， e by经过， e across遇上，句意是：在你学英语的过程中，你会遇到很多困难。选D。