—HasMarybeenback?—Notyet.Shewillcomeback______theeveningofJune______.A.

—Has Mary been back?
—Not yet.She will come back ______the evening of June ______.A.at,firstB.to,thirtiethC.on,the twelfthD.on,the nineteen

C解析考查时间介词和序数词。“玛丽回来了吗？”“还没。她一月二十晚上回来。”指具体的一天或上下午、晚上用介词on，排除A、B；D项的日期没有用序数词形式。故选C。

感谢回答，我学习了