问题补充：
--- Whose Chinese vase is it?
--- I have no idea, but I’m pretty sure it the old lady.
A. doesn’t belong to
B. belongs to
C. isn’t belonging to
D. is belonged to
答案：
(答案→)A. doesn’t belong to
B. belongs to
C. isn’t belonging to
D. is belonged to
解析：考查belongto的用法，belong to不能用被动或进行时，句意：--这个中国花瓶是谁的？--我不知道，但我确定不是那个老太太的。选A。
