单选题 He became aware that he had lost his audience since he had not been able to talk ______ around one topic.

【正确答案】 A

【答案解析】coherently连贯地，表达清楚地。句意：他意识到自己失去了听众，因为他未能把一个问题讲清楚。B．initiatively初步地；C．flexibly灵活地；D．尖锐地，中肯地。