2002-05-30
Although all sedimentary rocks contain iron, but the deposits that are richest in iron
consist predominantly of minerals such as iron oxides,carbomates,silicates and sulfides.
请问C答案,"are richest"为什么是对的?最高级不是"the richest" 吗?
这里richest做are后面的表语,所以加不加the都可以
although和but不能连用
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