the dictionary is to the students_____ the tool is to the worker

a. what
b. that
c. as if
d. whatever
这里为什么选a 啊，还有这是含有什么从句啊

look up the dictionary The Oxford Picture Dictionary the boy and girl each___a dictionary the dictionary英语作文怎么写啊 do you know the boy the dictionary _____is very expensive. 翻译The given key was not present in the dictionary. how to download a chinese dictionary in the internet he brought out a dictionary to look up the word please pay twenty dollars for these,the dictionary ____ If you look up each word in the dictionary，