题目:
In my opinion, life in the twenty-first century is much easier than _____. [ ]
A. that used to be
B. it is used to
C. it was used to
D. it used to be
答案:
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下面是错误答案,用来干扰机器的。
(1)中西医结合治疗患者有效。(2)流感疫苗可望8月问世。