Don't you think important to protect our earth A.that B.how C.it D.this

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Don't you think important to protect our earth A.that B.how C.it D.this

C. it , 不定式作宾语补足语,为了避免头重脚轻,用it引导
希望能帮到你,祝更上一层楼O(∩_∩)O

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