You _________ all the calculations of the students’scores.We have the computer software to do that job. (2011.4真题)-湖北继续教育网网校

[单选题]You _________ all the calculations of the students’scores.We have the computer software to do that job. (2011.4真题)

Aneedn’t have doneb.mustn’t have donec.shouldn’t have doned.couldn’t have done

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