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．everyB．a(chǎn) C．eachD．some
A
考查固定結(jié)構(gòu)。表示每隔幾年，要用every +數(shù)詞+ years結(jié)構(gòu)，所以選A。
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