As we all know,the whole life of the doctor___studying the origin of cancerA has devotedB was being devoted toC was devoted toD has been devoted to

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Asweallknow,thewholelifeofthedoctor___studyingtheoriginofcancerAhasdevotedBwasbeingdevotedtoCwasdevo

As we all know,the whole life of the doctor___studying the origin of cancerA has devotedB was being devoted toC was devoted toD has been devoted to
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

As we all know,the whole life of the doctor___studying the origin of cancerA has devotedB was being devoted toC was devoted toD has been devoted to
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.

D has been devoted to

D 啊!