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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。
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