They often change the kind of crop in each field ____ few years, for example, growing corn or wheat and then the next year peas or soybeans.
| A．every | B．a | C．each | D．some |
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They often change the kind of crop in each field ____ few years, for example, growing corn or wheat and then the next year peas or soybeans.
| A．every | B．a | C．each | D．some |
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