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In my opinion, life in the twenty-first century is much easier than ___________.
A.that used to beB.it is used to
C.it was used toD.it used to be
D

试题分析:句意:我认为,生活在21世纪要比过去容易得多。 than 引导的是一个比较从句,同一个人或物,现在和过去两个不同的时间进行对比时,应该用人称代词,因此要有主语it,而used to be 是“曾经的那个样子”之意。故选D。
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