It's important for young people____nine hours a night .为什么横线

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It's important for young people____nine hours a night .为什么横线上要填to sleep啊,v-ing不行吗?

结构上：实际上是：It is important to do sth结构,for young people 只是补充限定的；很少有It is +形容词+doing结构的；
词汇上：important后面没有用（或者不常用）（不常用的,对语言来说,就是错误的）doing sth 这种结构,如国你跟外国人口头交流的时候,对方能听懂,但是对于书面语言来说,就显得层次低了；
important：to do sth or 跟that 从句；
估计楼主还初、高中吧,

It's important for young people____nine hours a night .为什么横线 I b___ it's important to sleep eight hours a night I( )it is important to sieep eight hours a night. I think it's important for us ____(sleep) eight hours a nigh i believe it's important to sleep fight hours a I __ it important to sleep eight hours a night.A.need B.sure it,important,I,sleep,a,hours,is,believes,to night,eight(.)(连 I__________it\'s important to sleep eight hours a night怎么填 It is important for children ____(sleep) nine hours a day it's important to me还是it's important for me?mother buys a ne It's important for sb I believe that it's good____ ____for 9 hours a night.我相信一晚睡九