OG13-78

阿萨德积极

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

正确答案是C
这里OG上说A:are trimmed should be have been trimmed.
但是我认为既然有了after,这里就可以表达出动作的先后顺序，所以即使不用have been trimmed也是可以的。
请指教！

mickeyszlee

首先排除d，e，因为用if
然后排除a，因为visit 是see 的条件，2个动作不是并列的。
在排除b，此处用their，会呗误解为游客的horn。。。不符合逻辑。。
后面的东西不用看了。。。

haiyueqinhui

楼主提的这点很好！

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.

我不知道are trimmed会不会被gmac承认，但是have been在这里更适合；
因为是要说明这件事发生后产生的影响，所以用现在完成时更好。