请NN们帮帮忙! CD22的一道逻辑题

Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.  Although snow geese are a popular quarry for hunters in the southern regions where they winter, the hunting season ends if and when hunting has reduced the population by five percent, according to official estimates.  Clearly, dropping this restriction would allow the other species to recover.

Which of the following, if true, most seriously undermines the argument?

1. Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.
2. It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.
3. The number of snow geese taken by hunters each year has grown every year for several years.
4. As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.
5. In the snow goose’s winter habitats, the goose faces no significant natural predation.

 答案是B,不太明白啊

呵呵  明白了啊

谢谢

B. It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.

这句话是如何翻译的啊？我怎么看不懂后面的结构呢？

该规定导致snow geesing的猎杀比正常时间提前那是好多年前的事了.

the hunting season for snow geese being closed earlier than the scheduled date.

这是一个独立主格结构. hunting season for snow geese是逻辑主语.

PS:我的语法理论水平也就这么高,说不定部分语法词汇给写错了,见谅. 希望能够看得懂我的表述.