Notuntilabout20000BC_________

发布时间：2020-07-28 07:09:10

Not until about 20 000 BC _________ done．A.were known of the oldest paintingsB.the oldest of known paintings wereC.the oldest known were paintingsD.were the oldest known paintings

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D解析not until置于句首，主句用部分倒装，were要提到主语the oldest known paintings前面。
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