1.The reason for all the changes being m1.The reason for all the changes being made ____to us yet.A has not explainedB has not been explained请问选什么,为什么?

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1.The reason for all the changes being m1.The reason for all the changes being made ____to us yet.A has not explainedB has not been explained请问选什么,为什么?
1.The reason for all the changes being m
1.The reason for all the changes being made ____to us yet.
A has not explained
B has not been explained
请问选什么,为什么?

1.The reason for all the changes being m1.The reason for all the changes being made ____to us yet.A has not explainedB has not been explained请问选什么,为什么?
B,主语是reason,being made是修饰changes的

有yet则一般为现在完成时,而这句话的翻译是 所有的改变的原因现在没有(被)向我们解释,因为有被,所以是被动语态be explained,现在完成时have或has+been,所以选B
如果A在not后面加一个been就对了

B主语是the reason 所以y用被动式