题目内容


. The reason for all the changes being made _______to us yet.
A．has not explainedB．has not been explained
C．did not explainedD．were not explained
B
考查时态。根据题中时间状语yet可知用现在完成时态，根据语境可知用被动形式。句意：正在作所有改变的原因还没有向我们解释。
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