If you don’t know the new word you’d better ＿＿.A. look up a dictionaryB. look up an dict

问题补充：

If you don’t know the new word, you’d better ＿＿.

A. look up a dictionary

B. look up an dictionary

C. look it up in a dictionary

D. look up it dictionary

答案：

A. look up a dictionary

B. look up an dictionary

(答案→)C. look it up in a dictionary

D. look up it dictionary

解析：句意：如果你不认识新单词，你最好查字典。Look up查阅（字典），当宾语是代词时，要放在动词和副词中间，如look it up，所以选C。