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  3. The introduction of a computer into the production line has raised the output more than if one hundred more trained workers_____

The introduction of a computer into the production line has raised the output more than if one hundred more trained workers_____

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问题 The introduction of a computer into the production line has raised the output more than if one hundred more trained workers______put on the job.
选项 A、had been
B、were
C、be
D、would be
答案A
解析 这是含蓄虚拟条件句过去时的一种形式，全句的意思是“生产线采用电脑大大提高了产量，比再增加一百个熟练工人所能生产的还要多”。than后面省略了虚拟条件句的主句，如果补全了应是：…than one hundred more trained workers would／could havedone if they had been put on the job．
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