This dictionary is _____ to my reading, but that one is __________

A.great help; helpless

B.a great help; of no use

C.important; of few importance

D.very helpful; of no any use

答案及解析： B

解析：

"is_{_t}o"所以横线上应该填一个名词，倘若＿后是介词＂for"则应填一个形容词．所以答案是"a great help"；

"of no use "中的“no"后面不能再加　＂any" 因为"no"本身就相当于＂not any"或"not a "的意思。"be of no use"也就是"be not useful" 是一个固定搭配.所以答案是"B"