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单选题
17.The reason why they changed their mindto us yet.
A
A. has not explained
B
B. has not been explained
C
C. did not explain
D
D. was not explained
答案解析
正确答案：B
解析：
17.［翻译】他们还没有向我们解释改变主意的原因：【精析】B根据句中的时间状语yet时知，主句应用现在完成时，表示过去发生的动作或事情对现在仍有影响，着 眼点在现在.根据句意可知.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，即主句谓 语■动词用"have/lias been +过去分词”的形式 故选B
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