With all his attention on the computer game the boy even didn't notice his mother came i

问题补充：

With all his attention on the computer game, the boy even didn notice his mother came in.

A. was fixing

B. was fixed

C. fixing

D. fixed

答案：

A. was fixing

B. was fixed

C. fixing

D. fixed

解析：考察with复合结构。With好妹妹不能加句子，排除AB。With符合结构：With+宾语+宾语补足语，his attention与fix构成被动关系，使用过去分词表示被动。故D正确。