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• it's difficult for sb to do造句

• i find it difficult to造句

• difficulties造句

• itisvitaltodosth造句

• itisforsbtodosth造句

• it is difficult to do something

• it is vital for sb to do造句

• it is tadj for sb to do sth造句

• it is one's duty to do造句

• it isadj.+for/of sb. to do造句

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