问题补充：
Here are three balls, ?
A. which one is the bigger
B. what ball is the bigger
C. which one is the biggest
D. what ball is biggest
答案：
A. which one is the bigger
B. what ball is the bigger
(答案→)C. which one is the biggest
D. what ball is biggest
解析：可联系答.案.网客服索取。
