____carefully for a long time，the opening was a great success A． To have been prepared B． Having bee...
2022-10-25 15:15:51 119次 2014-2015学年北京市海淀区高三上学期期中考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
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
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