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题库 / OG2021-SC-854
Although the earliest inhabitants of Mapungubwe, building their dwellings of either wattle and daub or unfired mud brick, by the thirteenth century buildings of coral blocks in lime mortar began to appear.
earliest inhabitants of Mapungubwe, building their dwellings
earliest inhabitants of Mapungubwe, who built their dwellings
earliest inhabitants of Mapungubwe built their dwellings
dwellings of the earliest inhabitants of Mapungubwe, built
dwellings of the earliest inhabitants of Mapungubwe, which were built
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这道题最主要的是Although后面需要一个完整的句子，只有C有主谓宾，而D的built应该是were built, 不需要逗号隔开。
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