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    18、-- Bob ______ with Scrooge's company for 10 years in poor working conditions before he

      retired．

    --- Oh, dear．That ______ the most trying part of his life．

    A．had been; could have been                   B．has been; couldn't have been

    C．had been; must have been                          D．has been; shouldn't have been

    18、C

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    -- Bob ______ with Scrooge's company for 10 years in poor working conditions before he

      retired．

    --- Oh, dear．That ______ the most trying part of his life．

    A．had been; could have been                   B．has been; couldn't have been

    C．had been; must have been                          D．has been; shouldn't have been

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