问题补充：
In the USA, the students who study business is more than those who study agriculture.
A. as many as ten times
B. as ten times than
C. ten times as many as
D. than ten times
答案：
A. as many as ten times
B. as ten times than
(答案→)C. ten times as many as
D. than ten times
解析：这题考查倍数的表达：倍数+as+adj+as，句意是：在美国，学习商业的学生是学习农业的学生的十倍。选C。
