Oetzi, the 5,000 years old “Iceman”, on the alpine border between Italy and Austria in 199

网友回答

A. was discovering
(答案→)B. was discovered
C. had been discovered
D. discovered
解析：本题的含义是在1991年，在意大利和奥地利的边界发现了冰人，本题是过去发生事，应该用过去时，本题的主语为动作的承受者，故用被动语态，结构为be+过去分词，发现discover的过去分词是discovered，故选B。