The opening ceremony is a great occasion; it is essential ______ for that.[2003]
A、
for us to be prepared
B、
that we are prepared
C、
of us to be prepared
D、
our being prepared
【正确答案】
A
【答案解析】
解析:在It is essential/important等结构中,我们可以用不定式结构或从句;但如果使用从句,就必须用虚拟语气,所以答案中只有A符合要求。B项的谓语动词如改用be或should be则正确。
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