As we all know,the whole life of the doctor____studying the origin of cancerA 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?
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![As we all know,the whole life of the doctor____studying the origin of cancerA 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?](/uploads/image/z/11844654-6-4.jpg?t=As+we+all+know%2Cthe+whole+life+of+the+doctor____studying+the+origin+of+cancerA+has+devoted+to+B+was+being+devoted+to+C+was+devoted+to+Dhas+been+devoted+to%E9%80%89%E5%93%AA%E4%B8%AA%2C%E4%B8%BA%E4%BB%80%E4%B9%88%3F%E6%AF%8F%E4%B8%AA%E9%80%89%E9%A1%B9%E8%A7%A3%E9%87%8A%E4%B8%8B%3F)
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