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. A visible on many copper items, and is produced-->R,注意后面有by..所以要用 is produced. B that is visible on many copper items, and which produces-->which 有指代 items 的嫌疑. C visible on many copper items, and produces-->produces 无法和后面的by对应. D that is visible on many copper items, and that produces-->多了that 成了后面的句子修饰bloom,改变句意. E which is visible on many copper items, and which is produced-->which 和which 并列,使得后一句话修饰bloom改变句意,一般来说限制性定语从句不用 which
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. A visible on many copper items, and is produced B that is visible on many copper items, and which produces C visible on many copper items, and produces D that is visible on many copper items, and that produces E which is visible on many copper items, and which is produced 应该和主句并列?? 选A
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. A visible on many copper items, and is produced 对
B that is visible on many copper items, and which produces which使得produce的对象变成了copper items,而不是aerugo
C visible on many copper items, and produces that指代从句中的subj,不能扔。is 与produces不平
D that is visible on many copper items, and that produces 双that使得green bloom变成了produces的主语
E which is visible on many copper items, and which is produced which使得produce的对象变成了copper items,而不是aerugo