It is to see a monkey the bicycle.
A. fun, be riding
B. a fun, riding
C. funny, rode
D. fun, riding
网友回答
A. fun, be riding
B. a fun, riding
C. funny, rode
(答案→)D. fun, riding
解析：
试题分析:考查名词和非谓语动词。fun是不可数名词，前面没冠词，排除B选项；see sb doing sth“看见某人做某事”，由此可知D选项正确。句意：看猴子骑自行车是非常有趣的事。