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

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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。