问题补充：
I could feel my heart beating violently I went on the stage to sing a song.
A. for the first time
B. by the time
C. every time
D. from time to time
答案：
A. for the first time
B. by the time
(答案→)C. every time
D. from time to time
解析：every time可以作为连词来用，意为“每一次…的时候“。 每一次登上舞台表演的时候我都能感到自己的心在剧烈的跳动。
