When I am not sure of the spelling or pronunciation of a word, I will _____ the dictionary for it.
A.look upB.look overC.referD.consult在线课程D
句意：当我不能确定一个词的拼写或发音时，我将查一下字典。look up 查字典，它的宾语是具体的内容，如单词，句子等，不能是字典。故选D。