I think it__ our responsibility to do something for the

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I think __it____ our responsibility to do something for the 2008 Olympic Games.
为什么要填it?it指代什么?

此时的it做形式宾语.当不定式、动名词、从句等复杂成分用作宾语且其后跟有宾语补足语时,通常会在宾语补足语前使用形式宾语it,而将真正的宾语移至句末,其基本结构为“动词+it+宾语补足语+不定式(动名词或从句)”：
说几个例子
I find it difficult to do the job well.我发现做好这件事不容易.
I think it best that you should stay here.我认为你最好住这儿.
We think it no use complaining.我们认为抱怨是没有用的.
如第二个句子,认为（think）后边的东西（you should stay here）太长,为了避免头重脚轻干脆放后边,而在think紧后边用个it代替you should stay here.it是形式宾语,you should stay here才是真的宾语.这是英语中的常见用法

I think __it____ our responsibility to do something for the 填补句子的空缺：I think we should do something to ( )our thanks to o I think it is important for me to do something to protect bi 英语翻译i am happy for you do something to me,i believe that our I think it important for us to do something 什么情况下is可以省略吗? I think you have to do something for your mistake or you wil 不是有i think it easy for me to do something吗,那么i think it easy I's something we____ to do in our free time just for the____ 英语翻译而是 "our responsibility is doing （或to do) responsible for It is something we like to do in our free time just for the “It is something we like to do in our time just for the fun I think the best thing for you to do is do reply a writing t