__fun it is to play basketball A what B how Cwhat a Dhow a 要解析.
问题描述：
__fun it is to play basketball A what B how Cwhat a Dhow a 要解析.
答
用what,因为fun是名词,所以用what句型,what a/an +可数名词单数,或者what +不可数名词：且fun为不可数名词,所以用第二种句型