The opening ceremony is a great occasion. It is essential______for that.A、for us

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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 主语从句用法题。题意:“开幕式是重要的场合,我们应该为此做好准备。”it在句中为形式主语,真正的主语既可由不定式引导,也可由从句引导,故D选项错误。另外,由不定式引导时,应使用for连接人称代词,故C错误。如果由that从句引导,通常从句要用动词原形,即that we be prepared。因此,正确答案是A。
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