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ASince it is necessary for about nine-tenths of the volume of sea water to evaporate for rock salt to be formed, it is believed
ASince it is necessary for about nine-tenths of the volume of sea water to evaporate for rock salt to be formed, it is believed
admin
2014-01-13
21
问题
A
Since
it is necessary for about nine-tenths of the volume of sea water to evaporate for rock salt to be formed, it is believed that the thick rock rock-salt beds that are found B
were deposited
C
in
D
what are used to be
partly enclosed seas.
选项
答案
D
解析
句意是,既然十分之九的海水蒸发形成岩盐是有必要的,那么我们可以相信,发现的厚厚岩盐床曾储存在以前海水覆盖的地方。主句讲到的是过去的情况,be used to表示习惯于做某事,应用used to be表示过去习惯于做某事,所以选项D错。
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