yesterday, our school organized a successful picnic in the countryside, with all the students and teachers taking part in.
A. As a fine day
B. It was a fine day
C. It being a fine day
D. For it was a fine day
网友回答
A. As a fine day
B. It was a fine day
(答案→)C. It being a fine day
D. For it was a fine day
解析：考查非谓语动词，分词做状语，It being a fine day相当于Because it was a fine day,原因状语从句，所以选C，句子意思“昨天是个晴朗的天，我们学校组织了一个成功的在乡下野餐旅游，所有的学生和老师都参加了”