Its very kind you to say so

Its very kind you to say so
用for 还是of两者有什么区别 
英语人气:529 ℃时间:2020-05-30 06:36:33
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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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