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

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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