____carefully for a long time, the opening was a great s Wap版

试题详情及答案解析

____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

答案：B

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