【正确答案】 D

【答案解析】[解析] 画线词原形obscure为动词，意为“遮挡”。A项darken意为“使……变黑暗”；例：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。B项hold意为“保持……状态”；例：They held themselves in readiness for bad news. 他们对坏消息已经作好了准备。C项blacken意为“使……变黑”；例：Smoke has blackened the ceiling of the room. 烟已经把房间的天花板熏黑了。D项veil意为“挡住”；例：She made no attempt to veil the contempt in her voice. 她语气中毫不掩饰她的轻蔑。故选D。