I think __our duty to keep our evirionment clean an tidy.A.t

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I think __our duty to keep our evirionment clean an tidy.A.this B.that C .it D.it's

C .it 和 D.it's都是对的.
选C,则是think it+名词或形容词+to do sth,it是形式宾语,真正的宾语是后面的不定式to do.而名词或代词是宾语补足语.整个句子是个简单句；选D则think后面是个宾语从句.
再问：这是单项选题呀，怎么判断这种呢？
再答：那你就选C。it吧。题目出得不好。出题的意图是想让你选C。但他们疏忽了，忘了D，it's也是对的。这是think的重要的用法。【俊狼猎英】团队为您解答。

I think __our duty to keep our evirionment clean an tidy.A.t I think it's our duty to keep our environment clean and tidy I think _______ our duty to keep our environment clean and t It is our duty to keep our classroom clean and tidy.中的It《our It is our duty to keep our classroom clean and tidy.中 our du It is our duty to keep our classroom clean and tidy.句中的 clea It is our duty to keep our schoolyard clean and tidy.这句话是主语从 We feel _____ our duty to keep our city clean and tidy. 1、To keep our environment clean and tidy is our duty.(改为同意句）英语句型转换1、To keep our environment clean and tidy is our duty.( It is our duty to keep our e___ clean and tidy It is our duty to keep our classroom clean and tidy.这句话谁做主语谁