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

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
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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