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8．要想更好地了解世界，我們有必要學好英語．
It is necessaryfor us to learn English well to know more about the world．

分析 for us to learn English well

解答根據中英文對照，it在這做形式主語，真正主語用動詞不定式to learn English well，可以聯想到句型it is+adj．+for sb+to do sth．故答案是for us to learn English well．

點評根據中英文對照再分析句子結構，得出正確答案．

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