it is happy _______ us to help people in need.----Yes.And it

it is happy _______ us to help people in need.----Yes.And it is polite _____ us to do so.
it is happy _______ us to help people in need.----Yes.And it is polite _____ us to do so.
A.for ,for B.for ,of C.of ,for D.of ,of

It is happy _______ us to help people in need.----Yes.And it is polite _____ us to do so.A.for ,for B.for ,of C.of ,for D.of ,of
虞其君英语答案为B
英语解析：for Sb.对于某人来说,happy强调的是to help people in need 这件事.
of Sb.某人怎么样,polite强调的是us（我们）,说明我们是有礼貌的.
中文翻译：我们帮助在困难中的人们是很开心的.
我们如此做是多么有礼貌.