Autumn coming the leaves have turned into brown color.A. frequentlyB. graduallyC. exactl

问题补充：

Autumn coming, the leaves have turned into brown color.

A. frequently

B. gradually

C. exactly

D. regularly

答案：

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。