When you don’t know a word you can in the dictionary. A. look it upB. set it up C. give

问题补充：

When you don’t know a word, you can in the dictionary.

A. look it up

B. set it up

C. give it up

D. pick it up

答案：

(答案→)A. look it up

B. set it up

C. give it up

D. pick it up

解析：考查短语辨析。look up查询；set up竖立;建造；give up放弃；pick up拾起，收拾 ；学到;获得。句意：当你不认识一个单词的时候，你可以查字典。故A正确。