【正确答案】 D

【答案解析】[解析] obscure：遮挡。prevent：挡住。If you stand there you'll obscure our view of the race. 如果你站在那里，你会挡住我们看赛跑的。The storm prevented an early departure. 暴风雨阻碍了早些离开。darken：使变暗；使阴郁。The bad news darkened their view of the situation. 这条坏消息使得他们对情况的看法变得很悲观。hold：保持……状态。They held themselves in readiness forbad news. 他们对坏消息已经做好了准备。blacken：使……变黑。Smoke has blackened the ceiling of the room. 烟已经把房间的天花板熏黑了。