题目内容：

when he was young,he used to_hard at his lesson
Adevote to working B devote himself to work C be devoted to wok D be devoted to woking
为什么B不对?

优质解答

是D啊!
前面说在他年轻的时候,
he used to devote himself to working hard
he used to be devoted to working hard
他过去常常很努力的工作

devote ... to 强调动作
be devoted to 强调状态