有一道题SC不太理解，希望有童鞋帮忙分析指点，灰常感谢！

minigreen

Bufo marinus toads, fierce predators that will eat frogs, lizards, and even small birds, are native to South America but were introduced into Florida during the 1930’s in an attempt to control pests in the state’s vast sugarcane fields.
(A) are native to South America but were introduced into Florida during the 1930’s in an attempt to control
(B) are native in South America but were introduced into Florida during the 1930’s as attempts to control
(C) are natives of South America but were introduced into Florida during the 1930’s in an attempt at controlling
(D) had been native to South America but were introduced to Florida during the 1930’s as an attempt at controlling
(E) had been natives of South America but were introduced to Florida during the 1930’s as attempts at controlling



正确答案是：A

觉得这个选项的时态有点奇怪，
1.为什么是用一般现在时 “are native” , 而不能用had been native呢？

还是我没有理解对这句话的意思（我的理解是toads先是native to South America, 然后再were introduced into Florida的。也就是说这种toads是在1930年的时候就已经在South America土生土长的，但是后来在1930年被引入到Florida）

2.为什么不能用native of呢？ native of 和 native to的区别是什么呢

感谢解答^^

victor198506

1. 因为这个生物是south america的土生物种是真理，所以现在时
2. 这道题应该考的不是native的固定搭配，考的是attempt to这个固定搭配

victor198506

而且应该natives是土著人的意思，更应该指人...

minigreen

victor198506 发表于 2013-3-30 16:36
而且应该natives是土著人的意思，更应该指人...

刚才查了一下字典说 native to 的用法：
(of plants, animals, etc) originating in a place （指动植物等）原产於某地的: plants native to America, eg tobacco, potatoes 原产於美洲的植物（如烟草﹑ 马铃薯） * The tiger is native to India. 这种虎原产於印度.

native of
person born in a place, country, etc, and associated with it by birth 当地人; 本国人: a native of London, Wales, India, Kenya
没有找到be native of的用法，我想是不是用native of时native作的名词 而不是形容词

minigreen

谢谢你的解答。不过我还是有点疑问哈，如果用过去完成时had been，就意味着在把这种生物引进到Florida之前，这种生物就土生土长在South America。had been不是指从1930之前到1930吗，这样看起来好像也没有问题。

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理解这个问题了，如果一种生物是某个地方土生土长的，不管之后怎么样，都可以说是这个地方土生土长的，所以用一般现在时。

victor198506

minigreen 发表于 2013-3-30 16:53
谢谢你的解答。不过我还是有点疑问哈，如果用过去完成时had been，就意味着在把这种生物引进到Florida之前 ...

是的，除非它灭绝了