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

解析从句意和结构要求可确定答案为A。其中，it充当形式主语，句子的真正主语是“for us to be prepared for that”。此外，“It is essential”后也可跟that从句，但从句要用虚拟语气，因此B项错误。

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