2. 外语
  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 本题为单词用法题。答案为D)，因为that time通常前指，指代前面的时间1945年，而this通常后指。
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