2. 外语
  3. The chemical facts ______ as a by-product of their search for gold became the basis for modem chemistry.

The chemical facts ______ as a by-product of their search for gold became the basis for modem chemistry.

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问题 The chemical facts ______ as a by-product of their search for gold became the basis for modem chemistry.
选项 A、that had been accumulated by alchemists
B、were accumulated by alchemists
C、alchemists accumulating them
D、had been accumulated by alchemists
答案A
解析
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