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题库 / GMATAdvanced-SC-43
Avalanches at Rogers Pass in Glacier National Park killed more than 200 people between 1885 and 1910, but they are now controlled if not prevented; cannons are fired at the slopes to make snow masses fall before they become dangerous.
Avalanches at Rogers Pass in Glacier National Park killed more than 200 people between 1885 to 1910, but they
More than 200 people have been killed by avalanches between 1885 and 1910 at Rogers Pass in Glacier National Park, but they
Between 1885 and 1910, more than 200 people were killed by avalanches at Rogers Pass in Glacier National Park, but they
More than 200 people have been killed by avalanches at Rogers Pass in Glacier National Park between 1885 and 1910, but such avalanches
Avalanches at Rogers Pass in Glacier National Park killed more than 200 people between 1885 and 1910, but such avalanches
考点：
1. 指代词, they vs. such avalanches。用they除了指代不明之外，更主要是错误的。道理跟"人不能两次踏进同一条河流"一样。开头的avalanches已经发生了，是不可能在现在又被控制且预防将来发生，只能是还未出现的、类似规模的新avalanches才可能被控制/预防。如果用they，指代的就是当年发生的雪崩。而如果用such avalanches则表示的是新的、同等性质的雪崩。
2. 时态。between 1885 and 1910是一个过去的时间段，用过去时。
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