Is （ ）necessary to complete the design before the National Day? A this B that C it D he说下原因

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• Is （ ）necessary to complete the design before the National Day? A this B that C it D he说下原因
• Is it necessary to complete the design before the National Day?是什么意思Is (it ）necessary to complete the design before the National Day?括号里为什么用it不用this,that和he却用it顺便将这句话翻译一下
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• Is （ ）necessary to complete the design before the National Day? A this B that C it D he
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