问题补充：
The new school is our previous one.
A. as three times big as
B. three times so big as
C. three times the size of
D. three times as bigger as
答案：
A. as three times big as
B. three times so big as
(答案→)C. three times the size of
D. three times as bigger as
解析：倍数表达句型。倍数 +the 名词 +of ;倍数+ 比较级 +than；倍数+as 原级 as 。句意：新学校是旧学校的三倍大。
