【问】The Portuguese give a great deal of credit to one man for having promoted sea travel，thatman_______ Prince Henry the navigator，who lived in the 15th century.

A. is B.was C. has D.had (《硕士研究生入学考试英语答卷典型错误分析及全真模拟题库》)

书上给的答案是A(is)，但我认为这个答案是错误的。不知哪个选项是正确的?

【答】 书上所给的四个选项都是错误的。上道题应填being。详细的情形，请见being²。