The man ( ) France will give us a talk ( ) his country.

The man ( ) France will give us a talk ( ) his country.
A.from,on B.of,in C.of,about D.from,of
答案是A,
第二空的on=about “关于”还有哪些情况一个介词在句中含义等于另外一个介词，能举个例子吗如：on study 论学习。