帮我解答两个单选题 1、A:It's necessary and important___school teachers to teach their students how to get on well with others. B:Yes,you said it. a,of b,for c,from d,to 2、China has made a great contribution___preventing SARS. a,for b,to c,with d,in 最好有选某个答案的原因,
1.B for It's +adj(形容词)+for sb/sth to do 如果该形容词可以用来修饰此人 应用 It's+adj(形容词)+of sb to do 如 It's kind of you to help me.这里的you是善良(kind)的 但此题中necessary and important不能修饰school teachers 故用for 用for 的时候形容词necessary and important是表示后面所说的事情是重要必要的 2.B make a great contribution to 是固定搭配 contribute 动词形式也应和 TO 搭配