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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