My father to Nanning many times, so he knows it well.
A. went
B. will go
C. has gone
D. has been
网友回答
A. went
B. will go
C. has gone
(答案→)D. has been
解析：句意：我的父亲去过南京许多次，因此他非常了解它。在完成时态中has been to 是已经去过某处，并且已经回来了。has gone to 是已经去了某处，但是到目前为止还没有回来。 has been in 是已经在某处，并且现在还在那里，而且有可能要延续下去。 结合语境可知选D。