Mr smith_______with the company for 40 years by the time he retired.A would have worked B had workedC has worked D had been woring为什么选b 什么情况下可以选d
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![Mr smith_______with the company for 40 years by the time he retired.A would have worked B had workedC has worked D had been woring为什么选b 什么情况下可以选d](/uploads/image/z/11858200-16-0.jpg?t=Mr+smith_______with+the+company+for+40+years+by+the+time+he+retired.A+would+have+worked+B+had+workedC+has+worked+D+had+been+woring%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89b+%E4%BB%80%E4%B9%88%E6%83%85%E5%86%B5%E4%B8%8B%E5%8F%AF%E4%BB%A5%E9%80%89d)
Mr smith_______with the company for 40 years by the time he retired.A would have worked B had workedC has worked D had been woring为什么选b 什么情况下可以选d
Mr smith_______with the company for 40 years by the time he retired.
A would have worked B had worked
C has worked D had been woring
为什么选b 什么情况下可以选d
Mr smith_______with the company for 40 years by the time he retired.A would have worked B had workedC has worked D had been woring为什么选b 什么情况下可以选d
B
由于后面的时间状语从句,用了一般过去时,表明【过去的事情】,故主句用过去完成,因为主句动作发生在从句动作前.