OG83,OG35 关于it指代

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35. In June of 1987, The Bridge of Trinquetaille, Vincent van Gogh’s view of an iron bridge over the Rhone sold for $20.2 million and it was the second highest price ever paid for a painting at auction. (A) Rhone sold for $20.2 million and it was (B) Rhone, which sold for $20.2 million, was (C) Rhone, was sold for $20.2 million, (D) Rhone was sold for $20.2 million, being (E) Rhone, sold for $20.2 million, and was why "it in A has no logical referent", 我觉得很明显it refers to The Bridge of T, 怎样才算指代,是不是要主格的代词指句中的主语,宾格指代宾语成分? 83. Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not. (A) a condition when it is present and indicate that there is one (B) when a condition is present and indicate that there is one (C) a condition when it is present and indicate that it is present (D) when a condition is present and indicate its presence (E) the presence of a condition when it is there and indicate its presence 请说明为什么C对,而其它不对如indicate that there is one/its presence when it is not.