Question

—Has Mary been back?
—Not yet.She will come back ______the evening of June ______.

1. A.
   at,first
2. B.
   to,thirtieth
3. C.
   on,the twelfth
4. D.
   on,the nineteen

Answer 1

C
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。