什麼a，play的介詞

介詞是in，例如：

1、The previous year Adolphson had starred in a play in which Ingrid had been an extra上一年，阿道夫森在一部戲劇裡擔任主角，當時英格麗在劇中還只是個臨時演員。

2、I did it the first time I went to see you in a play.我第一次去看你演出時就用過。

3、He rose at 7 a.m.， rehearsed all day and appeared in a play at night.他七點鐘起床，排了一天戲，晚上演出。