单选题 ______ no cause for alarm, the old man went back to his bedroom.
A. There was B. Due to C. As to D. There being

【正确答案】 D
【答案解析】[解析] 独立主格结构
没有需要戒备的迹象，那位老人就又回房休息去了。代词there加be动词的现在分词可构成独立主格结构，表示一种伴随的状态。这是一个重要的语法考点。