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The chemical facts ______ as a by-product of their search for gold became the ba
The chemical facts ______ as a by-product of their search for gold became the ba
游客
2024-01-05
19
管理
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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