This method saved half the labor that______to combat the insects separately.A.would not ha

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This method saved half the labor that______to combat the insects separately.

A.would not have been needed

B.would have been needed

C.would not have needed

D.would have needed

请帮忙给出正确答案和分析,谢谢!

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答案解析

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  • 正确答案:B
    本题综合考查虚拟语气和被动语态。从句与过去事实相反(前面句中的过去时态提示),主句用should/wouldhave+过去分词。题意为,这种方法可以节省一半的劳动力,这些劳动力本来是需要被分出来对付昆虫的。