As we all know,the whole life of the doctor____studying the origin of cancer

题目

As we all know,the whole life of the doctor____studying the origin of cancer
A has devoted to B was being devoted to C was devoted to Dhas been devoted to
选哪个,为什么?每个选项解释下?

答案

选D.sb devote some time to doing sth.某人把时间奉献于做某事.the whole life作主语 应为：some time be devoted to doing （时间被奉献于做某事）现在用的是一般现在完成时,为some time has been devoted to doin...