It is necessary ( ) others when they are in trouble.Do you t

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It is necessary ( ) others when they are in trouble.Do you think so?
A.for us to help B.of us helping C.of us to help D.for us helping

it is +adi +of/for sb to do sth这个结构中,如果用of,中间的形容词是在描述sb.如果用for,中间的形容词是在描述动词不定式
it is kind of you to help me.你帮助我,真是好心.kind 是修饰you的
it is important for us to learn english well.学好英语对我们来说很重要.important是修饰动词不定式的
就本句,很明显necessary 是指to help others
因此选A

It is necessary ( ) others when they are in trouble.Do you t Please don't ________ others when they are in trouble. Don't （）others when they are in trouble. it is not polite to ( ) others when they are in trouble A ge It is wrong of you to ______ people when they are in trouble it is wrong of you to people when they are in trouble. I hate people who don't help others when they are in trouble I hate people_don't help others when they are in the trouble I think it's right__ others when they are in trouble.(help) It's good_(help) others when they are in trouble.急.谁告诉下啊 it's friendly ____ others when they are in trouble A.for us You should not laugh at others when they are in trouble改祈使句