Autumn ing, the leaves have turned into brown color.
A. frequently
B. gradually
C. exactly
D. regularly
网友回答
A. frequently
(答案→)B. gradually
C. exactly
D. regularly
解析：副词辨析。Frequently频繁地，经常地；gradually渐渐地；exactly恰好地；regularly定期地。句意：秋天来了，树叶渐渐的变成了褐色。故选B。