此题中 be necessary for 和 to的区别,为什么不能用to啊

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/06 13:29:38

此题中 be necessary for 和 to的区别,为什么不能用to啊
just as there are occupations that require college or even higher degrees, so too are there occupations___technical training is necessary.
A. for which B. to which
解析说的是定语从句,be necessary for 表示对...来说是必要的. be necessary to 不也表示对...来说是必要的吗,to 后面也可以加sth. 啊.

完整的形式应该是
be necessary for sb/sth to do sth
在不同情况下,可分为
be necessary for sb/sth
或者
be necessary to do sth
具体要看它在句子中后面跟的是名词还是不定式
所以这里是 technical training is necessary for the occupations

此题中 be necessary for 和 to的区别,为什么不能用to啊 be necessary for和 be necessary to的区别 be necessary for和be necessary to 有何区别 wanted to eat和wanted to ate的区别,就是说为什么不能用wanted to ate只能用want to be up for和be up for的区别为什么不能用must to be? use to,be used to do,be used to doing和be used for的区别 be used to do 和be uesd for 的区别 be leaving for和be leaving to的区别 be important to 和be important for的用法区别 be intended to do 和be intended for 的区别 be bad to和be bad for的区别?