Is ( )necessary to complete the design before the National D

问题描述:

Is ( )necessary to complete the design before the National Day? A this B that C it D he
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1个回答 分类:英语 2014-11-17

问题解答:

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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
 
 
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