Both teachers and students are busy________June．A.withB.atC.onD.in
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D解析分析：be busy in June(在六月时很忙)。“在”某个月份，介词用in．be busy with…意为“忙于做某事”，选with句意不通。(延伸)表示“在……时间”用in的情况：in the morning/in the afternoon/in the evening(但：at night)/in June(月份)/in spring(季节)/in 1978(年份)/in one's twenties(在某人二十几岁的时候)