这是谓语.老大...怎么能改成lacking呢. those college students, who died in their trip to Mount Everest, lacked a basic sense of responsibility for the society as well as for their families.
在这个句子中...I believe是主句...后面是宾语从句.其中who died in their trip to Mount Everest是those college students的定语从句..如果你还有不懂的那你QQ我吧493899533