He came here to discuss it with you.A. on purposeB. by chanceC. for purposeD. on design

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(答案→)A. on purpose
B. by chance
C. for purpose
D. on design
解析：句意，他特地来这里和你讨论它。on purpose 特地 by chance 偶然地 for purpose通常和 of搭配，意思为为了……的目的 on design 没有这个固定搭配，故选A。