With his attention on his book he didn’t notice me enter his study.A. focusingB. focuse

问题补充：

With his attention on his book, he didn’t notice me enter his study.

A. focusing

B. focused

C. to focus

D. focus

答案：

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