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21. Over five thousand years ago, archaeologists have discovered that Mesopotamian cooks were preparing chicken with coriander and tamarind, just as Egyptian cooks are still doing today. (A) Over five thousand years ago, archaeologists have discovered that (B) Over five thousand years ago, archaeologists had discovered that (C) Archaeologists have discovered that, over five thousand years ago, (D) Over five thousand years ago, as archaeologists have discovered it,（C） (E) Archaeologists have discovered, over five thousand years ago, that 请问 A 为什么不对呢？ 7. Less detrimental than the effects of bacterial transformation is the effects of bacterial deterioration: spoilage of food, metals corroding, decay of wood, and other undesirable alterations of substances. (A) is the effects of bacterial deterioration: spoilage of food, metals corroding (B) are the effects of bacterial deterioration: spoilage of food, metals corroding (C) is the effects of bacterial deterioration, which include spoilage of food, metals corroding (D) are the effects of bacterial deterioration, which includes spoilage of food, corrosion of metals（E） (E) are the effects of bacterial deterioration: spoilage of food, corrosion of metals D错了 是因为which的用法不对么？ 谢谢 | 
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发表于 2006-9-7 22:43:00
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