单选题 He was so absorbed ______ his work that he didn't notice me entering his room.

【正确答案】 D
【答案解析】固定搭配。他完全投入到了工作中,没有注意到我已走进他的房间。▲be absorbed in:沉浸于,完全被迷住了。其他选项无法与absorb搭配。