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 语法题。本题考查的是被动语态和现在完成时的用法。理由被解释,应该用被动,yet是完成时的标志词。所以此题选B。本句意为:他们改变主意的原因还没有向我们解释。
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本试题收录于: 英语题库普高专升本分类
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