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    15、--Congratulations.

    --Thank you．But for your help, we             in the experiment．

    A．will never succeed                                      B．shouldn’t have succeeded

    C．couldn’t have succeeded                             D．mustn’t have succeeded

    15、C

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    --Congratulations.

    --Thank you．But for your help, we             in the experiment．

    A．will never succeed                                      B．shouldn’t have succeeded

    C．couldn’t have succeeded                             D．mustn’t have succeeded

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