The reason why they changed their mind______to us yet.

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问题 The reason why they changed their mind______to us yet.

选项 A、has not explained
B、has not been explained
C、did not explain
D、was not explained

答案B

解析由句中的yet可知，主句应用现在完成时，表示说话时已经做完了某事，着眼点在现在。而且reason和explain之间是逻辑上的动宾关系，所以应用现在完成时的被动语态。故选B。

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