题目内容
____carefully for a long time, the opening was a great success
A. To have been prepared
B. Having been prepared
C. To be prepared
D. Being prepared
B
【解析】
试题分析:句意:认真准备了很长时间,这次开幕式很成功。根据句意可知人们是在开幕式前进行准备工作,是过去发生的事情,应该用现在分词的完成式形式,选B。
考点:考查非谓语动词
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