You can have a good view of Nanjing at the top of Zijin Mountain a clear day.A. atB. onC.

问题补充：

You can have a good view of Nanjing at the top of Zijin Mountain a clear day.

A. at

B. on

C. in

D. for

答案：

A. at

(答案→)B. on

C. in

D. for

解析：句意：在晴朗的天气下，站在紫金山顶上你可以清楚的看到南京的风景。表示时间的名词前面如果有形容词形式，如本题中有clear，修饰day，用介词on,故选B