2. 外语
  3. The language has always changed, Abut the rate of change has been uneven; minor changes have slowly accumulated in every generat

The language has always changed, Abut the rate of change has been uneven; minor changes have slowly accumulated in every generat

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问题 The language has always changed, Abut the rate of change has been uneven; minor changes have slowly accumulated in every generation, but there have been Bperiod of rapid change Cas well. The most important of these periods occurred during the two hundred and fifty years after 1066, the Dyear the Normans conquered England.
选项
答案B
解析 根据B项所在句的“have been”可知，这里用的是复数形式，因此应将“period of rapid change”改为“periods of rapid change”。
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