问题补充：
Our hall is ＿＿＿＿theirs.
A. twice so large as
B. twice as large as
C. as twice large as
D. so twice large as
答案：
A. twice so large as
(答案→)B. twice as large as
C. as twice large as
D. so twice large as
解析：表示“是……的几倍”常用twice/three times as... as... 的结构。
