As we all know,the whole life of the doctor___studying the origin of cancer
问题描述：
As we all know,the whole life of the doctor___studying the origin of cancer
A has devoted
B was being devoted to
C was devoted to
D has been devoted to
答
D.是整个生命被投入到研究癌症上面去,所以用被动语态.而且是已经被投入,用完成时.