2. 外语
  3. Agriculture was a step in human progress ______ subsequently there was nothing comparable until our own machine age.

Agriculture was a step in human progress ______ subsequently there was nothing comparable until our own machine age.

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问题 Agriculture was a step in human progress ______ subsequently there was nothing comparable until our own machine age.
选项 A、to which
B、signal
C、from which
D、in which
答案B
解析
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