Some dogs just don’t know fun.A. how haveB. how to haveC. how havingD. how to has

问题补充：

Some dogs just don’t know fun.

A. how have

B. how to have

C. how having

D. how to has

答案：

A. how have

(答案→)B. how to have

C. how having

D. how to has

解析：考查疑问词+不定式结构。句意：一些狗只是不知道怎样玩得高兴。选B。