我个人认为选B,奶牛的产奶量上升了,如果单陈述的话,是cows' milk production.定语从句中只能用whose做系动词了.that 是只是名词性代词,而whose是形容词性指示代词.
求具体的解题过程和原理have you ever heard about cows ＿milk production g
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