The opening ceremony is a great occasion. It is essential______for that.A、for us

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问题 The opening ceremony is a great occasion. It is essential______for that.

选项 A、for us to be prepared
B、that we are prepared
C、of us to be prepared
D、our being prepared

答案 A

解析虚拟语气题。在It Is essential／important等结构中，我们可以用不定式结构或从句；但如果使用从句，就必须用虚拟语气，所以只有[A]符合要求。[B]项的谓语动词如改用be或should be则正确。

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