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,.....
选B sb be devoted to sth.这里是非谓语动词,He was devoted to his research,省略He was于是得到答案B 若要选A,应当是He devoted himself to his research,由于是主动,应为:Devoting himself to his research,.....