问题
选择题
At a very young age, Professor Field used to__________ books on radio.
A．devote to translating
B．devote himself to translate
C．be devoted to translate
D．be devoted to translating
答案
答案：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.
符号表示