书名：寂天 阅读满分2
页数：p46
题目：Housing prices in the metropolitan area have a tendency to increase in g
eneral, but they rose ______ in the Jasper neighborhood.
A)sharpen
B)most sharply
C)sharp
D)sharpness
疑问：
答案是B)
想请问C)为什么不行，sharp不是也能当副词吗？
谢谢