none of this 还是none of these啊求真相!经常看到用none of this 的

none of this 还是none of these啊求真相!经常看到用none of this 的 前面讲了一大串的东西,为什么对其否定时,用none of this而不用none of these?我在书上看到的. 求none of的用法 none of this will be easy是什么意思 用none of造句 None of these social probiems is ( )(独有的）to this country.填什么 none后面的谓语动词用单数还是复数?none of呢? none of students 和none of the students 的区别 none of them和none of whom的区别 some和some of,none和none of的区别 none of 的反义词是? none of these fields are changable