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  3. More has been learned since 1945 about the chemical changes in the body than in all human history before_________time.

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

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问题 More has been learned since 1945 about the chemical changes in the body than in all human history before_________time.
选项 A、in
B、that
C、which
D、the
答案B
解析 这里指的是在1945年之前的那个时期，并有强调之意。选项B是正确的。【句子大意】自从1945年以来，我们对人体化学变化的了解比1945年之前的整个人类历史所了解的还要多。
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