You______ all those calculations!We have&nbs-考呗网

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单选题 You______ all those calculations!We have a computer to do that sort of thing.

A． needn't have done
B． must not have done
C． shouldn't have done
D． could not have done

【答案】A。解析：needn’t have done sth．意为“本不必做某事，但实际上做了”，本句句意为你根本不必做那些计算，我们有做那些事情的电脑。must not have done sth．意为“一定不能做某事”；shouldn’t have done sth．意为“不该做某事但做了”；could not have done sth．意为“不可能做某事”，这三项均不符合题意。故正确答案为A。

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