问题补充：
As we have known from the map of the world，this is .
A. twice as large an island as that
B. twice as larger as that island
C. as twice large as that one
D. twice as a large island as that
答案：
(答案→)A. twice as large an island as that
B. twice as larger as that island
C. as twice large as that one
D. twice as a large island as that
解析：考查倍数表达. 正确结构应该是：倍数 +as adj+a/an+n as ；第一个as是副词，所修饰的形容词要紧跟在它后面，形容词所修饰的名词要跟在形容词的后面。所以应该使用：as large an island as。句意：正如我们从地图上所看见的一样，这是一个比那个岛大两倍的岛屿。选A。
