look up 只能指在字典中查么?

题目

look up 只能指在字典中查么?
回答标题和下面的问题,
-couldn you tell me what time the train leaves Hefei for Beijing?
-I'm afraid you need to _____ on the Internet
A,look for it
B look at it
C look it over
D look it up

答案

肯定选D ,真相永远只有一个,首先AB 排除,介词后无代词,c是检查,例如查病