You _____ all those calculations! We have a computer to do that sort of thing. A.needn.t have done B.shouldn.t have done C.must not have done D.can not have done

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You _____ all those calculations! We have a computer to do that sort of thing.
A.needn.t have done
B.shouldn.t have done
C.must not have done
D.can not have done

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