devote:vt.致力于；奉献
这里应该填devoted to
要用devoting的话,应该是填devoting himself to
这样,2者的意思都是致力于（直译是：把自己奉献于）研究.
devoting his research的意思是“把他的研究奉献出去”,与语意不符.
_______(致力于）his research he spared no time to spend a weeken
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