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

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

选项 A、would not have been needed
B、would have been needed
C、would not have needed
D、would have needed

答案B

解析 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/would have+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。
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