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.

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答案D

解析 改为has not been explained。explain为及物动词,explain sth to sb向某人解释某事,这里的原因是被解释的,应用被动语:态。
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