We are sure everything here by the time you come back from abroad in a few years.A. had c

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A. had changed
B. will have changed
C. had been changed
(答案→)D. will have been changed
解析：考查时态。句意：我们相信这的一切事情，在你几年后从国外回来时能够全部改变。结合语境可知从句描述的是将来某个时刻完成的动作，用将来完成时态，everything是被改变的对象，故用被动语态，选D。