问题补充：
When you study the local map, you will find this town is.
A. twice as a large town as that
B. twice the size that one
C. twice as larger as that one
D. twice as large a town as that one
答案：
A. twice as a large town as that
B. twice the size that one
C. twice as larger as that one
(答案→)D. twice as large a town as that one
解析：句意为：当你研究当地的地图时，你会发现这座城镇是那个的两倍大。倍数的表达方式：A is＋倍数＋as+adj（原形）+as＋B；A 项中不定冠词位置错误；应该是在large后面，B项中的size后面应该加of，C项中as 后应用形容词原级。选D
