carefully for a long time, the opening was a great successA. To have been preparedB. Having been pr

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【题目】____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

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【答案】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。