2. 外语
  3. The opening ceremony is a great occasion. It is essential ______ for that.

The opening ceremony is a great occasion. It is essential ______ for that.

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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 It is essential that句型中谓语动词要使用虚拟语气，例如：It is essential that he(should)be prepared for this．重要的是他要为此做好准备。由此我们可以将 B 排除。介词of和for都可以引导出不定式的逻辑主语，其区别为：of后面的名词或代词与句子表语是逻辑主表关系，而for后面的名词或代词却与句子表语没有任何关系，例如：It is kind of you to help me out．你真好，帮助我渡过了难关。It is easy for
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