题目内容：

＿ to his research,he almost forgot everything.A.Devoting B.Devoted C.To devote D.Devote 据说

优质解答

答案选B
sb be devoted to sth.这里是非谓语动词在句中作原因状语从句,He was devoted to his research,省略He was于是得到答案B
假如要选A,应当是He devoted himself to his research,由于是主动,应为：Devoting himself to his research,.