题目内容

Look! There are so many mistakes in your composition. You ________ have fixed full attention on it.
A．can B．should
C．need D．might
B
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。
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