I don;t think it wise 这个句型中,it 作形式宾语,要求填的空白处缺少了不定式,所以初步选定A,B两个答案.其次,A,B 答案中 for sb和of sb 的区分方法是of sb 前面的形容词往往是表示品质类的词,如wise good polite ,nice kind.等.
如 It is necessary for us to do more exercises.
It is not polite of you to say so to your parents.
答案选 B