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  3. It is essential that all these figures are to be checked twice.

It is essential that all these figures are to be checked twice.

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问题 It is essential that all these figures are to be checked twice.
选项 A、 
B、 
C、 
D、 
答案C
解析 应改为(should)be，形容词essential要求其主语从句中的谓语用(should+)动词原形的形式。
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