Look! There are so many mistakes in your position. You have fixed full attention on it.
A. can
B. should
C. need
D. might
网友回答
A. can
(答案→)B. should
C. need
D. might
解析：选B 考查情态动词。句意：看！你的作文里有那么多的错误。你本应该把所有的注意力都集中在它上面的。表示“本应该做但实际上没有做”应该用should have done结构，故选B。