单选题：According to the passage, what did the farmers have to do wi

题目内容：
According to the passage, what did the farmers have to do with the coming of mechaniza-tion of agriculture? A．Many of them had to leave their farmland for industrial centers．
B．They stuck to their farm work．
C．They refused to use machines．
D．They did their best to learn how to use the machines．

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