The two things are the same in outward form but different.A. in additionB. in briefC. in c

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A. in addition
B. in brief
C. in mon
(答案→)D. in essence
解析：
考查介词短语词义辨析。in essence本质上，符合句意。in addition此外；in brief简短地，简言之；in mon共同。