The opening ceremony is a great occasion. It is essential______for that.（2003年考试

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问题 The opening ceremony is a great occasion. It is essential______for that.（2003年考试真题）

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…结构中，我们可以用不定式结构或从句，但从句必须用虚拟语气，所给答案只有A符合要求。B中的谓语动词如果改用be或should be则正确。

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