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Aerugo, also known as verdigris, is the green "bloom" visible on many copper items, and is produced, like iron rust, over the course of time by the exposure of the metal to the oxygen in the atmosphere. • visible on many copper items, and is produced
• that is visible on many copper items, and which produces
• visible on many copper items, and produces
• that is visible on many copper items, and that produces
• which is visible on many copper items, and which is produced
这里都好加an后面接的不是完整句子 GMAT考试里面不是应该不能这么用的吗? 为什么A是正确答案 这题严格来说是不是没有正确答案?
谢谢各位啦!!!!!!!!!!!!!
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