He didn't notice entering the room with his attention _____o

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He didn't notice entering the room with his attention _____on his papers.
A.concentrated B.concentrating C.to concentrate D.having concentrated
为什么选A?是非谓语吗?作状语?

with his attention __concentrated___on his papers 是with加复合宾语结构作伴随状语,
concentrated与attention 是逻辑上的主谓关系.（His attention was concentrated on ...)
固定短语： sb+concentrate one's attention on sth某人把注意力集中到某事

All his attention ___on the novel. so he didn't even notice (1).in an experiment,they didn't notice me entering the room _______in conversation,they didn't notice me entering the ro —— in his study,he didn't notice that the teacher had come u 1.With his attention ( D ) on a novel ,the student didn’t no With all my attention ____ my homework,i didn't even notice ___himself in his studies,he didn't notice that his father c because of his _ on his studies,he didn't notice me passing With his attention -------on the shops along the roadside,he 变同义句：He didn't go to the theater with his parents,he stayed He didn't go to the theater with his partents ,he stayed at He didn't allow smoking in his room,actually he didn't allow