单选题23.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.
【正确答案】
A
【答案解析】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．