单选题 The Portuguese (give) a great deal of credit to (one man) for (having promoted) sea travel, that man (was) Prince Henry the navigator, who lived in the 15th century.
【正确答案】 D
【答案解析】was 改为 being。that man前是一个逗号，两个句子前都没有连词，逗号不能连接并列句，所以不能用谓语动词was。改为being后，和that man构成分词独立结构作状语，表示补充说明。