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as的用法Thechemicalfactsasaby-productoftheirsearchforgoldbecamethebasisformodemchemistry..(A)thathadbeenaccumulatedbyalchemists(D)hadbeenaccumulatedbyalchemists在这两个选项中应该选择哪一个?我选的是D,

题目详情
as的用法
The chemical facts __ as a by-product of their search for gold became the basis for modem chemistry..
(A)that had been accumulated by alchemists
(D)had been accumulated by alchemists在这两个选项中应该选择哪一个?我选的是D,因为AS也可以当成连词用.但答案是A,作为定语从句.
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答案和解析
看句子的主干.the chemical facts(主语) became(谓语动词) the basis for...
前面that had been accumulated by alchemists是作为定语从句来形容主语的