I forgot his phone number that day.I had to the phone book to find it. A. look upB. look

问题补充：

I forgot his phone number that day.I had to the phone book to find it.

A. look up

B. look through

C. look to

D. look at

答案：

A. look up

(答案→)B. look through

C. look to

D. look at

解析：look through意为：粗略地翻阅; 细审…。look up意为：抬头看2.生意、某人的情况等 好转；改善3.拜访(某人)4.查找。