More have been learned since 1945 about chemical changes in the body than in all

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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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