单选题 The Prime Minister frequently wandered from his text to ______ on a point that had obviously caught his audience's interest.
A. stress B. interrupt C. elaborate D. explain

【正确答案】 C
【答案解析】[考点] 动词用法辨析
[解析] 首相时不时地对听众关心的问题进行脱稿解释。elaborate on意为“详细说明”。故C项为正确答案。