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 as that one
D. twice as a large island as that
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(答案→)A. twice as large an island as that
B. twice as larger as that island
C. as twice as that one
D. twice as a large island as that
解析：考查倍数：倍数+as+adj+an/a+名词as，先是twice，然后是as +形容词（large）an island +as…,句意：从世界地图上我们可以看出这是那个岛两倍的岛屿。选A。