2. 专升本
  3. More have been learned since 1945 about chemical changes in the body than in all human history before______time.

More have been learned since 1945 about chemical changes in the body than in all human history before______time.

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问题 More have been learned since 1945 about chemical changes in the body than in all human history before______time.
选项 A、this
B、the
C、the past
D、that
答案D
解析 句意：自1945年以来所了解的人体内的化学变化比之前整个人类历史所了解的都多。词义辨析题。因为指示代词that通常前指，即指代前面的时间1945年，而this通常后指。故答案为D。
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