351. In 1929 relatively small declines in the market ruined many speculators having bought on margin; they had to sell, and their selling pushed other investors to the brink. (A) speculators having bought on margin; they had to sell, and (B) speculators who had bought on margin; having had to sell, (C) speculators who had bought on margin; they had to sell, and (D) speculators, those who had bought on margin; these speculators had to sell, and (E) speculators, who, having bought on margin and having to sell,
286. Even today, a century after Pasteur developed the first vaccine, rabies almost always kills its victims unless inoculated in the earliest stages of the disease. (A) its victims unless inoculated (B) its victims unless they are inoculated (C) its victims unless inoculation is done (D) the victims unless there is an inoculation (E) the victims unless inoculated
isn't C better than B, avoiding ambiguity of "they". the same problem
以下是引用bigcamel在2004-1-10 10:21:00的发言: here, "rabies" is singular. and it is better to use the verb form of "inoculation"
i am hardly convinced of the explanation, look at this
大全21 21. A proposal has been made to trim the horns from rhinoceroses to discourage poachers; the question is whether tourists will continue to visit game parks and see rhinoceroses after their horns are trimmed. (A) whether tourists will continue to visit game parks and see rhinoceroses after their horns are (B) whether tourists will continue to visit game parks to see one once their horns are (C) whether tourists will continue to visit game parks to see rhinoceroses once the animals’ horns have been (D) if tourists will continue to visit game parks and see rhinoceroses once the animals’ horns are (E) if tourists will continue to visit game parks to see one after the animals’ horns have been