it is one's n .to do sth/It's adj for(of) sb to do sth
在这里it 是形式宾语
Everyone must think __it‘s__ our duty to protect the enviroment.加了's的话think后面的就是一个完整的句子的,做think的宾语,就变成一个宾语从句了.不加's就是简单句,it做形式宾语,真正的宾语是to protect the enviroment,
Everyone must think __it__ our duty to protect the enviromen
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相关问题
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