专四
A．for us to be prepared
B．that we are prepared
C．of us to be prepared
D．our being prepared
【解析】essential的用法。essential在表示“做某事非常有必要”时常见于结构It is essential that…或It is essential(for sb．)to do sth．，因此选项A为正确选项。由于该结构在跟that从句时需使用虚拟语气(shoud)do…，因此选项B错；没有D这种结构；It is…of sb．to do sth．结构中is后所跟形容词为主语补语．常为nice，kind，generous，willing，reluctant，deliberate等描写人物特征、品德的形容词，essential不能用于这种结构．故不选C。
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