D
考查非谓语动词.句意:在他非常年轻的时候,菲尔德教授常常致力于翻译有关无线电的书籍.used to中to是不定式符号,后面接动词原形,be devoted to致力于,to是介词,后面接名词或者动名词作宾语,故选D.
At a very young age, Professor Field used to__________
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