Is （ ）necessary to complete the design before the National Day? A this B that C it D he
题目
Is （ ）necessary to complete the design before the National Day? A this B that C it D he
说下原因
答案
C it 形式主语,真正的主语是 to complete the design before the National Day
肯定句是：To complete the design before the National Day is necessary
举一反三
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