问题补充：
both his eyes focused on his book, he didn’t notice me enter the room.
A. Through
B. Because of
C. For
D. With
答案：
A. Through
B. Because of
C. For
(答案→)D. With
解析：考查with复合结构：从both his eyes focused on his book,可以看出，这是宾语+过去分词做宾语补足语，只有with可以搭配复合结构，句意：因为两只眼睛专注的看着书，他没有注意到我进来。选D。
