_______ yesterday, our school organized a successful picnic in the countryside, with all the students and teachers taking part in.A.As a fine dayB.It was a fine dayC.It being a fine dayD.For it was a fine day
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C解析试题分析：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”考点：考查非谓语动词
点评：非谓语动词是个难点，也是高考常考内容之一，要求学生掌握它的用法。