1．Doctor Nathan is said to have been ________ to researching into wild animals in Africa for more than ten years.
A．absorbed B．devoted
C．concentrated D．engaged
答案 B [表示“投身于，全神贯注于……”有如下结构：be absorbed in；be devoted to；be engaged in；concentrate on。故四个选项中只有devote和to搭配使用。]
