He went ahead ________ all warnings about the danger of his mission.

A. in case of           

B. because of           

C. prior to         

D. regardless of

【答案解析】本题目正确选项D。【译文】他仍然继续，不顾对自己使命的危险性的警告。 解析：在四个备选项中，A项in case of假设, 万一，B项because of因为，C项prior to在前, 居先，D项regardless of不管, 不顾。因此，根据题意，本题的正确答案应该选择D。