As soon as the manager entered his office he began to the telephone book on his desk.A.

问题补充：

As soon as the manager entered his office, he began to the telephone book on his desk.

A. look up

B. look into

C. look upon

D. look through

答案：

A. look up

B. look into

C. look upon

(答案→)D. look through

解析：动词短语look up查找，向上看；look into调查；look upon看不起；look through仔细检查[审查]（某物）；穿过…看；对（某人）视而不见；句义：经理一进入办公室，他就开始仔细看自己桌上的电话号码簿。根据句义说明D项正确。