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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
未划线部分they指代snow masses，前面不能再有they
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