标题: PREP SC-求救牛牛们~~~ [打印本页] 作者: 小猫依米 时间: 2010-9-12 22:11 标题: PREP SC-求救牛牛们~~~ Lessthan 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killerbees, had migrated as far north as southern Texas. (A) Less than 35 yearsafter the release of African honeybees outside Sao Paulo, Brazil, (B) In less than 35 yearssince releasing African honeybees outside Sao Paulo, Brazil, (C) In less than the 35 yearssince African honeybees had been released outside Sao Paulo, Brazil, (D) It took less than 35years from the release of African honeybees outside Sao Paulo, Brazil, when (E) It took less than the35 years after the time that African honeybees were released outside Sao Paulo,Brazil, and then
答案选a，但是我觉得D选项也是对的，我看了解释，他是这样说的- it不能指代介系词词组from the release，我不是很明白他的意思，怎么判断it是指代的对象？？？？ 此外，(A)正确， after + n.结构避免了逻辑主词问题，这里的逻辑主词是什么意思？？ 谢谢过路的大侠帮忙~~~作者: bijinjing 时间: 2010-9-13 09:14
it做形式主语时都是to do的不定式，it做to do的形式可以，其他的短语和句子，it都不能指代的。after加动词的话，after的主语变成了Brazil，逻辑上说不过去，不是Brazil release