题目内容
（请给出正确答案）
[主观题]
The （three-fields) system is an agricultural method in which one field （out of) （three) is
The (three-fields) system is an agricultural method in which one field (out of) (three) is (left) to lie fallow while the other two fields are being cultivated.
A．three-fields
B．out of
C．three
D．left
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