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单选题
91.The opening ceremony is a great occasion. It is essential _______ for that.
A
for us to be prepared
B
that we are prepared
C
of us to be prepared
D
our being prepared
答案解析
正确答案：A
解析：
解析:语法规则和词汇知识。for us to be prepared for that为不定式复合结构,在句子中充当真正的主语(it 是形式主语)。essential还可以用于下列结构:It is essential that...,但that从句中的谓语动词需要用虚拟语气形式,所以B不对。essential不引导动名词复合结构,所以D也不对。essential强调所要做的事,而非描述做事的人,所以C也不妥。开幕式是一个很重大的场合。我们必须为此做好准备。
相关知识点：
开幕式我们得做好准备
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