You ______ all those calculations. We have a computer to do that sort of thing. 选项: A:must not have done B:should not have C:can not have done D:needn.t have done

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You ______ all those calculations. We have a computer to do that sort of thing.
选项:
A:must not have done
B:should not have
C:can not have done
D:needn.t have done

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