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The life we were used to ______ greatly since 1980.

A. change B. has changed C. changing D. have changed

B 【解析】句意:自从1980年我们过去的生活发生了巨大的改变。根据since 1980.可知是现在完成时态,主语是The life we were used to不可数名词;故选B
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