for和of用法的区别

for和of用法的区别
1.It's necessary ______us to master a language.
2.It's unwise ______them to refuse our help.
3.It is very important _____us to study some rules.
4.It is unpracticable ______us to finish such a difficult task
in such short time.
5.It's wrong _____a person to think only of himself.
哪些用of哪些用for,请说明原因,我老分不清楚.
英语人气:626 ℃时间:2019-10-05 02:28:37
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1.It's necessary ___for___us to master a language.2.It's unwise ___of___them to refuse our help.3.It is very important ___for__us to study some rules.4.It is unpracticable ___for___us to finish such a...
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