During the trip itself, they will be ______to high doses of radiation, raising their odds of getting cancer later in life, and they will lose bone density.
【正确答案】
D
【答案解析】解析：四个选项均可与介词to搭配使用，与之搭配之后。选项A“be sympathetic to sth．”意思是“赞同，支持”；选项B“be ascribed to sth．”意思是“被归因于”；选项C“be preferable to sth．”意思是“更好”；选项D“be subjected to sth．”意思是“受到，遭受，经受”。综合比较各选项意思，只有D选项符合句意，故选D。