within five years,more colour than black-and-white TV sets were being used

within five years,more colour than black-and-white TV sets were being used

题目
within five years,more colour than black-and-white TV sets were being used
这是课本中原句,为什么用were being used?详细说明理由
答案
首先意思是: 近五年来彩色电视要比黑白电视机用得广
从句子的时态看出,从说话的这一刻起彩电与黑白电视使用的状态还在进行中, 所以用Being
而另外又是从过去到现在的五年内故用Were
再补充一点电视是被用来看的故用 being used
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