The opening ceremony is a great occasion; it is essential ______ for that.[2003]

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问题 The opening ceremony is a great occasion; it is essential ______ for that.[2003]

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 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,所以答案中只有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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