The reason Afor all Bthe changes Cbeing made Dhas not explained to us yet.

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问题 The reason Afor all Bthe changes Cbeing made Dhas not explained to us yet.

选项 A、
B、
C、
D、

答案D

解析应改为has not been explained。因the reason与explain为逻辑上的动宾关系，所以应用被动语态。

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