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
科目：高中英語(yǔ) 來(lái)源： 題型：
-- 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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