单选题 She was so absorbed in her job that she didn't hear anybody knocking at the door.
【正确答案】 B
【答案解析】be absorbed in为固定搭配，意为“专心致志做某事”，相当于 be interested in；选项D．concentrate后接介词on，意为“专心致志于……”；选项 A．attracted“吸引，引起……的注意”；选项C．drawn“吸引”，与attract可以互换。