Once the president has made a（ ）decision, he no longer dwells on

Once the president has made a（ ）decision, he no longer dwells on it.
A、considerate
B、considering
C、considerable
D、considered
【正确答案】：D
【题目解析】：considerate体贴的；considering考虑到；considerable相当大的；considered经过深思熟虑的；根据句意一旦总统做了一个深思熟虑的决定，他就不再停留在这个决定上，故选D。