With his attention on his book, he didn’t notice me enter his study.
A. focusing
B. focused
C. to focus
D. focus
网友回答
A. focusing
(答案→)B. focused
C. to focus
D. focus
解析：考查with 的复合结构。题意为 他集中注意力到书，没有注意到我进行他的书房。Focus one’s attention on 集中精力于。With sth done/dong /to do ,focus与attention 之间是被动关系，故选B项。
考点 with 的复合结构