. 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
考查時態(tài)。根據(jù)題中時間狀語yet可知用現(xiàn)在完成時態(tài)，根據(jù)語境可知用被動形式。句意：正在作所有改變的原因還沒有向我們解釋。
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