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
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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
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.

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