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  3. 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

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问题 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 that the thick rock rock-salt beds that are found Bwere deposited Cin Dwhat 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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