Forthefollowingreaction,clearlystatewhatchangehastakenplace（）

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clearlystatewhatchangeha Forthefollowingreaction ce

Forthefollowingreaction,clearlystatewhatchangehastakenplace（）

A.addedtwoH

B.eliminatedtwoH

C.eliminatedoneC

D.substitutedbytwoH

正确答案：B

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